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Full text of "2006 Final Ashumet Phosphorus Barrier Technical Memorandum"

CH2M HILL 

318 C East inne* Road 
Otis ANGB MA 02542 



CH2MHILL 



21 March 2007 



Mr. Jonathan S. Davis 

Remediation Program Manager 

HQ AFCEE/MMR 

322 East Inner Road 

Otis ANG Base, MA 02542-5028 

SUBJECT: AFCEE 4P F41624-03-D-8595; Task Order 0384 
MMR SPEIM/L TM/O&M Program 
CDRL#A001H 
Final Ashumet Pond 2006 Phosphorus Barrier Technical Memorandum 

Dear Mr. Davis: 

As directed by the Air Force Center for Environmental Excellence, CH2M HILL is hereby 
distributing copies of the Final Ashumet Pond 2006 Phosphorus Barrier Technical 
Memorandum dated February 2007. Enclosed are six bound copies, one unbound copy and 
nine compact disc (CD) copies. Copies are also being sent to the appropriate agencies. 

Mr. Jon Davis is the Air Force point of contact for this project and can be reached at 
(508) 968-4670, extension 4952. 

Sincerely, 
CH2MHILL 



Patricia de Groot, P.G M L.S.P. 
Program Manager 



Enclosures (6 bound. 1 unbound & ° CDs) 

c Melvin AJIi. AFCEE/IC A/COR ( 1 CD) 
AFCFFTMSCD(ICD) 
HSW/PKVH (1 w/o attach.) 
Paul Marchcssault, I PA ( I bound, 1 CD) 
Peter Ciolonka, GF ( I hound. I CD) 



Ixonard Pinaud, Ma&sDFP U bound, 1 CD) 
Denis UBIanc. USUS (I CD) 
Steven Solbo, Jr.. Mashpce Cons Com (! CD) 
Mark K.asprzyk> Falmouth Cons Com ( I CD) 
CH2M HIM- Document Control & Distribution 



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337I05"SPFIM-ASHK)-TFCHMEM-O02 



Massachusetts Military Reservation 




Final Ashumet Pond 2006 Phosphorus Barrier 
Technical Memorandum 

March 2007 



Prepared for: 

AFCEE/MMR 

Installation Restoration Program 

322 E. Inner Road 

Otis ANGB, MA 02542 



Prepared by: 

CH2M HILL 

318 E. Inner Road 

Otis ANGB. MA 02542 



337105-SPEIM-ASHPO-TECHMEM-002 



TABLE OF CONTENTS 

ACRONYMS AND ABBREVIATIONS iii 

EXECUTIVE SUMMARY ES-1 

1.0 INTRODUCTION 1-1 

1.1 SITE DESCRIPTION AND HISTORY 1-1 

1.2 BARRIER DESCRIPTION 1-3 

1.3 OJECTIVES AND ORGANIZATION 1-3 

2.0 2006 USGS BARRIER PERFORMANCE MONITORING 2-1 

2.1 PERMANENT SAMPLING NETWORK 2-2 

2.1.1 Vertical Multilevel Samplers 2-2 

2.1.2 Vertical Interface Diffusion Samplers 2-4 

2.1.3 Horizontal Multiport Samplers 2-5 

2.1.4 Deep Pond-Bottom Piezometers 2-6 

2.1.5 Seepage Meters 2-7 

2.2 TEMPORARY DRIVE POINT SAMPLING 2-8 

2.2.1 Phosphorus 2-9 

2.2.2 Inorganic Nitrogen (Nitrate and Ammonium) 2-10 

2.2.3 Physico-Chemical (Field) Parameters 2-1 1 

3.0 AFCEE BARRIER CHEMISTRY AND POND SEDIMENT DATA 3-1 

3.1 GROUNDWATER QUALITY RESULTS 3-1 

3.2 POTENTIAL PHOSPHORUS REMOVAL MECHANISMS 3-2 

3.3 SEDIMENT RESULTS 3-4 

4.0 SUMMARY AND CONCLUSIONS 4-1 

5.0 FUTURE MONITORING 5-1 

6.0 REFERENCES 6-1 

Figures 

Figure 1-1 Location of Ashumet Pond 

Figure 1-2 Phosphorus Plume and Discharge Area in Ashumet Pond (1999) 

Figure 2-1 USGS Permanent Barrier Sampling Locations 

Figure 2-2 Dissolved Phosphorus Concentrations Along Cross-Section A-A' 

Figure 2-3 Nitrate Concentrations Along Cross-Section A-A' 

Figure 2-4 Ammonium Concentrations Along Cross-Section A- A' 



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TABLE OF CONTENTS 



Figure 2-5 USGS Temporary Drive Point Locations 

Figure 2-6 Changes in Phosphorus Concentrations with Depth in the Geochemical 

Barrier 

Figure 2-7 Changes in Nitrate Concentrations with Depth in the Geochemical 

Barrier 

Figure 2-8 Changes in Ammonium Concentrations with Depth in the 

Geochemical Barrier 

Figure 2-9 Changes in Specific Conductance with Depth in the Geochemical 

Barrier 

Figure 2-10 Changes in Dissolved Oxygen Concentrations with Depth in the 

Geochemical Barrier 

Figure 2-11 Changes in pH with Depth in the Geochemical Barrier 

Figure 2-12 Changes in Groundwater Temperature with Depth in the Geochemical 

Barrier 

Figure 3-1 AFCEE Temporary Drive Point and Sediment Sampling Locations 



Tables 



Table 3-1 



Table 3-2 



2006 AFCEE Temporary Drive Point Barrier Groundwater 
Geochemistry Data 

2006 AFCEE Barrier and Pond Surface Sediment Data 



Appendices 

Appendix A 
Appendix B 

Appendix C 



U.S. Geological Survey 2006 Barrier Performance Report 

Comparison of Field- and Laboratory-Determined Phosphorus 
Concentrations 

Statistical Comparison of Phosphorus Concentrations vs. Depth in 
Barrier and Background Locations 



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Final 



ACRONYMS AND ABBREVIATIONS 



AFCEE 

bpb 

DO 

ft 

HMPS 

kg 

mg/d 

mg/kg 

mg/L 

MLS 

MMR 

PVC 

SpC 

TDP 

TM 

USGS 

WWTP 

ZVI 



Air Force Center for Environmental Excellence 

below the pond bottom 

dissolved oxygen 

feet 

horizontal multiport samplers 

kilogram 

milligrams per day 

milligrams per kilogram 

milligrams per liter 

multilevel samplers 

Massachusetts Military Reservation 

polyvinyl chloride 

specific conductance 

total dissolved phosphorus 

technical memorandum 

U.S. Geological Survey 

wastewater treatment plant 

zero-valent iron 



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Final 



EXECUTIVE SUMMARY 

The primary objectives of this technical memorandum are to: (1) present and evaluate the 
barrier performance data collected by the U.S. Geological Survey (USGS) and the Air 
Force Center for Environmental Excellence (AFCEE) during 2006; (2) characterize the 
general geochemical processes that are occurring within the barrier and identify the 
probable mechanisms of phosphorus removal; and (3) present the barrier monitoring 
approach for 2007. 

Ashumet Pond is a 215-acre kettle pond with a maximum depth of 19 meters 
(62.3 feet [ft]) and is located near the Massachusetts Military Reservation (MMR) on 
Cape Cod. The pond is fed primarily by groundwater seepage and has no surface water 
outlet. A phosphorus-rich groundwater plume, originating from the MMR wastewater 
treatment plant (WWTP) that operated between 1936 and 1995, has been discharging to 
Ashumet Pond for more than 20 years. A large mass of easily mobilized phosphorus 
remains adsorbed to the aquifer matrix between the former WWTP and Ashumet Pond 
and is expected to continue discharging (in the range of 48 to 110 kilograms [kg] per 
year) to the pond for decades. 

In an effort to address the effects of the phosphorus plume on the trophic state of 
Ashumet Pond, AFCEE developed the following three-phase remedial strategy: 
(1) implement a targeted phosphorus inactivation of the pond sediments in the deepest 
area of the pond to reduce the internal phosphorus load in the pond; (2) install a 
geochemical barrier within the plume discharge area in the pond to reduce the external 
phosphorus loading from groundwater seepage; and (3) continue the on-going water 
quality monitoring program for Ashumet Pond. 

Consistent with this strategy, a targeted phosphorus inactivation (alum treatment) of the 
hypolimnion was conducted in September 2001 using aluminum sulfate and sodium 
aluminate solutions. A geochemical barrier consisting of zero-valent iron (ZVI) filings 
mixed with the native sandy shoreline sediments was installed in August 2004 along that 
part of the shoreline where the highest concentrations of phosphorus are discharging. 



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The barrier is 300 ft long, approximately three ft thick, and extends approximately 40 ft 
offshore from the mean shoreline of Ashumet Pond. Barrier performance data collected 
in 2004 and 2005 indicated that the barrier was effectively removing phosphorus from the 
targeted part of the plume (AFCEE 2006). During 2006, the USGS collected barrier 
performance data from a permanent barrier monitoring network and from approximately 
200 temporary drive point sampling locations. The 2006 USGS data indicate that 
phosphorus is being removed from that part of the wastewater plume discharging to the 
pond through the barrier and that most of the removal is occurring within the interior of 
the barrier, well before reaching the interface between the barrier and the pond. These 
data suggest that the barrier is effectively reducing the external phosphorus load to the 
pond. 

In 2006, AFCEE collected general water quality and phosphorus concentration data from 
five temporary drive point locations within the barrier and sediment data from 
13 locations within or in the vicinity of the barrier. The general groundwater chemistry 
data indicate that highly reducing (e.g., denitrifying, sulfate reducing, and methanogenic) 
conditions have developed within the interior of the barrier where the majority of the 
phosphorus removal is occurring. These data suggest that the precipitation of a ferrous 
iron phase (vivianite) and/or a mixed valent iron-based layered double hydroxide phase 
(green rust) are the primary mechanisms of phosphorus removal by the barrier. The 
relatively low levels of phosphorus associated with oxidized iron-rich surface sediment 
samples of the barrier collected by AFCEE in 2006 support the conclusion that 
phosphorus is being removed from groundwater within the reducing interior of the barrier 
and before it can reach, and be adsorbed by, the thin oxidized iron-rich layer at the 
interface of the barrier and the pond. 



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1.0 INTRODUCTION 

This technical memorandum (TM) presents an evaluation of the performance and 
chemical characteristics of the Ashumet Pond phosphorus barrier during 2006. It has 
been prepared under the Air Force Center for Environmental Excellence (AFCEE) 
Installation Restoration Program, Contract Number F41624-03-D-8595, Task Order 
0384, at the Massachusetts Military Reservation (MMR). 

The data presented in this report were collected by the U.S. Geological Survey (USGS) 
and by AFCEE during the summer of 2006. The USGS collected a water quality data set 
using: (1) a permanent barrier monitoring network (installed in 2004 by the USGS); and 
(2) approximately 200 temporary drive points installed in 2006 within and in the vicinity 
of the barrier. Barrier performance data collected by AFCEE in 2006 included water 
quality data from five temporary drive point locations within the barrier and sediment 
chemistry data from thirteen surface sediment locations within and outside the barrier 
footprint. Salient aspects of the AFCEE data and the USGS data are summarized and 
evaluated in this TM. 

1.1 SITE DESCRIPTION AND HISTORY 

Ashumet Pond is a 215-acre kettle hole pond located near the MMR on Cape Cod 
( Figure 1-1) . The pond has a maximum depth of about 19 meters (62.3 feet [ft]); it is fed 
primarily by groundwater seepage and has no surface water outlet. A phosphate-rich 
groundwater plume (hereafter the phosphorus plume), originating from the MMR 
wastewater treatment plant (WWTP) that operated between 1936 and 1995, has been 
discharging to Ashumet Pond for more than 20 years. The section of the pond bottom 
where the phosphorus plume is discharging is hereafter referred to as the "plume 
footprint" ( Figure 1-2 ). 

Although the discharge of treated wastewater to the aquifer ceased in 1995, a large mass 
of easily mobilized phosphorus remains adsorbed to the aquifer matrix between the 
former WWTP and Ashumet Pond (McCobb et al. 2003; Walter et al. 1995). If no 



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remedial action had been implemented, dissolved phosphorus was expected to continue 
discharging to the pond (in the range of 48 to 110 kilograms [kg] per year) for decades 
(McCobb 2003; AFCEE 2002a). 

The trophic state of Ashumet Pond has degraded since 1969 when the pond was classified 
as oligotrophic (K-V Associates 1991). By the mid-1980s, phosphorus loading by the 
wastewater plume had been identified and the trophic state of the pond was mesotrophic 
with some early signs of stress (K-V Associates 1991). During the late 1980s and the 
1990s the trophic state of the pond gradually declined until it appeared to stabilize near 
the mesotrophic/meso-eutrophic boundary (AFCEE 2002a). Nevertheless, it has 
remained a concern that, unless remedial actions were taken, continued loading of excess 
phosphorus to Ashumet Pond from the wastewater plume would further degrade the 
trophic health of the pond (Walter et al. 1995; AFCEE 2002a). Consequently, routine 
trophic health water quality monitoring of Ashumet Pond has been conducted since 1999. 

In an effort to address the effects of the phosphorus plume on the trophic state of 
Ashumet Pond, AFCEE developed a remedial strategy that is outlined in the Final 
Ashumet Pond Phosphorus Management Plan (AFCEE 2001). The strategy consisted of 
the following three components: (1) reduce the internal phosphorus load by implementing 
a targeted phosphorus inactivation of the sediments in the deepest section of the pond; 

(2) install a geochemical barrier within the plume discharge area (i.e., plume footprint) to 
reduce the external phosphorus loading from groundwater to the pond ( Figure 1-2) ; and 

(3) continue the ongoing water quality monitoring program for Ashumet Pond. 

Consistent with this strategy, a targeted phosphorus inactivation (alum treatment) of the 
hypolimnion was conducted in September 2001 using aluminum sulfate and sodium 
aluminate solutions (AFCEE 2002b). A geochemical barrier (the barrier) was installed in 
August 2004 with the intent to trap phosphorus that otherwise would have discharged 
into the pond via groundwater. 



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1.2 BARRIER DESCRIPTION 

The barrier consists of three percent (by weight) zero-valent iron (ZVI) filings mixed 
with native sandy sediments of the pond and it was installed where the highest 
concentrations of phosphorus in the plume have historically been discharging to the pond 
( Figure 1-2 ). The barrier is 300 feet (ft) long, approximately three ft thick, and extends 
approximately 40 ft offshore from the mean shoreline of Ashumet Pond. Details of the 
barrier design, installation and the initial phase of barrier performance monitoring 
(conducted in 2004) can be found in the Final Ashumet Pond Geochemical Barrier 
Phosphorus Removal Design Testing & Installation Workplan (AFCEE 2004) and the 
Ashumet Pond Geochemical Barrier for Phosphorus Removal Installation Summary 
Report (AFCEE 2005). 

1.3 OJECTIVES AND ORGANIZATION 

The primary objectives of this TM are to: (1) present the 2006 USGS and AFCEE barrier 
data and evaluate the performance of the barrier; (2) characterize the general geochemical 
processes that are occurring within the barrier and identify the probable mechanisms of 
phosphorus removal; and (3) present the barrier monitoring approach for 2007. The 
report organization is summarized below. 



Section 1 
Section 2 
Section 3 
Section 4 
Section 5 
Section 6 



Introduction 

2006 USGS Barrier Performance Monitoring 

AFCEE Barrier Chemistry and Pond Sediment Data 

Summary and Conclusions 

Future Monitoring 

References 



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Final 



2.0 2006 USGS BARRIER PERFORMANCE MONITORING 

Between 03 August and 21 August 2006, the USGS conducted a barrier performance 
monitoring event. The primary objective of this sampling effort was to determine 
whether the geochemical barrier is continuing to reduce the external phosphorus load 
(from the former WWTP) to the pond ( Figure 1-2 ). The extent of phosphorus removal by 
the barrier was evaluated by comparing the phosphorus concentrations in groundwater 
collected just beneath the barrier to the concentrations of phosphorus in groundwater that 
has migrated into the middle and upper part of the barrier, prior to discharging to the 
pond. In order to evaluate the effect of the barrier on the general water quality of the 
wastewater plume, most barrier performance groundwater samples collected by the 
USGS were also analyzed for selected field parameters (e.g., dissolved oxygen [DO], 
pH). These field parameters were also used to identify those barrier samples that were 
inadvertently diluted with pond water during sample collection, resulting in phosphorus 
data that are not representative of the actual phosphorus concentrations in the barrier. 

A secondary objective of the USGS sampling was to evaluate the effects of the barrier on 
inorganic nitrogen compounds (e.g., nitrate). A small subset of the groundwater samples 
that were collected using the permanent monitoring network were also analyzed for 
ammonium, nitrate, and nitrite. All of the temporary drive point locations were analyzed 
for ammonium and nitrate. 

The sampling methods used by the USGS in 2006 to collect barrier performance data 
consisted of two general types: (1) groundwater samples and flow rate measurements 
collected within or near the barrier using five different types of sampling instruments that 
comprise the permanent USGS barrier monitoring network that was installed within the 
barrier in 2004; and (2) groundwater samples collected from temporary drive points 
installed within and adjacent to the barrier. 

Data collected by the USGS in 2006 from the permanent monitoring network and from 
the temporary drive point locations were tabulated, graphed, briefly summarized and 
submitted to AFCEE in a data summary letter ( Appendix A ). Some of the 2006 USGS 



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samples were analyzed for dissolved phosphorus by a USGS laboratory and some were 
analyzed in the field for orthophosphate using a less precise colorimetric method. The 
USGS orthophosphate data analyzed by the field colorimetric method are identified in the 
text as "field phosphate" and are presented in Appendix A as field phosphate expressed 
as milligrams per liter phosphorus (mg/L P). In 2006 the USGS used both methods to 
perform duplicate analyses of approximately 200 groundwater samples collected from 
drive point locations within and adjacent to the barrier. The USGS performed linear 
regressions of the phosphorus data collected by these two methods. The results indicate 
that the two methods produce generally comparable results for phosphorus concentrations 
higher than the 0.24 mg/L detection limit of the field colorimetric method ( Appendix B) . 
Details of USGS and AFCEE sampling and analytical methods were previously discussed 
in the Final Ashumet Pond 2005 Phosphorus Barrier Technical Memorandum (AFCEE 
2006). 

2.1 PERMANENT SAMPLING NETWORK 

The USGS permanent monitoring network was installed during barrier construction in 
2004 and consists of piezometers, vertical multilevel samplers (MLS), interface diffusion 
chambers, horizontal multiport samplers (HMPS), and seepage meters ( Figure 2-1) . 
Descriptions of the monitoring devices and brief summaries of the USGS data collected 
from these devices during the 2006 sampling event are presented below. When available, 
specific conductance (SpC) and DO data for these samples were used to verify that the 
samples collected near the interface of the barrier and the overlying pond has not been 
diluted by pond water. Samples collected near the barrier-pond bottom interface that are 
diluted by pond water commonly show abrupt increases in DO and decreases in SpC 
relative to undiluted samples collected at the same surface locations but from deeper in 
the barrier. 

2.1.1 Vertical Multilevel Samplers 

During barrier construction, eight permanent vertical MLS were installed within the 
barrier footprint and two (F639P01 and F645P01) were installed outside the barrier as 



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control locations ( Figure 2-1 ). Each MLS consists of Vi-inch diameter polyvinyl chloride 
(PVC) pipe fitted with five sampling ports at various depths below the pond bottom (bpb) 
(0.1, 0.8, 1.6, 2.2, and 3.4 ft). The deepest interval (3.4 ft) is positioned to sample ground 
water below the geochemical barrier. Each port is connected to the surface by a 
1/16-inch diameter polyethylene tube. Inside each sampling port, a fiberglass mesh 
screen is attached to the end of the interior tubing. The top of the sampler is fitted with a 
4-inch diameter PVC canister 0.4 ft in length. The purpose of this canister is to hold and 
protect the sample tubing as well as to protect the sampler top once the device is installed 
into the barrier. 

Results 

All ten MLS locations were sampled in August 2006 for the analysis of phosphorus, SpC, 
and DO by the USGS ( Table 1 in Appendix A) . Only three of the MLS locations were 
sampled for the analysis of the nitrogen species (ammonium, nitrate, and nitrite) and pH 
was measured at one location ( Table 1 in Appendix A ). Figures 3a through 3\ in 
Appendix A present vertical profiles of the dissolved phosphorus, SpC, and DO data 
collected from these ten sampling locations in August 2006. Data collected in 2004 and 
2005 are also presented for comparison with the 2006 data. Please note that the July 
2004 baseline data presented in these figures were collected immediately prior to barrier 
installation using temporary MLS devices ( Table 1 in Appendix A ). 

The DO and SpC data have been used as indicators of whether any shallow samples 
collected from the MLS devices had been diluted by pond water during sampling. The 
abrupt increases in DO and associated decreases in SpC values evident in the shallowest 
samples (0.1 ft bpb) collected from some MLS locations (e.g., Figure 3a in Appendix A) 
suggest that the very low phosphorus concentrations in these shallow samples are not 
representative of in situ barrier conditions and reflect unintended dilution with pond 
water during sampling. In those locations where there was evidence that pond water had 
diluted the shallow barrier samples (i.e., in F639P01, F641P01, F642P01, F644P01, 
F645P01, F646P01, and F647P01), the very low phosphorus concentrations in the 
shallowest sampling intervals (just below the pond-barrier interface), were not used in the 



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analysis of barrier performance. As a consequence, barrier performance for these seven 
locations was based on the changes in phosphorus concentrations between the 3.4 ft 
sampling interval (just beneath the barrier) and the 0.8 ft interval (0.8 ft bpb). 

A review of Figures 3a and 3g in Appendix A indicates that the 2006 phosphorus trends 
in the two control locations (FSW 639-P01 and FSW 645-P01) showed no notable 
reduction in the phosphorus concentrations between a sample depth of 3.4 ft and 0.8 ft 
bpb. Unlike these two control locations, however, there was a general trend toward 
decreasing phosphorus concentrations with decreasing depth (between 3.4 ft and 0.8 ft 
bpb) at the eight locations within the barrier footprint. Although the absolute 
concentrations of dissolved phosphorus detected at these locations have varied between 
the October 2004, July 2005, and October 2006 sampling events, there has been a 
consistent general trend toward decreasing phosphorus concentrations at shallower depths 
during each sampling event since the July 2004 baseline (pre-barrier installation) 
sampling event. 

2.1.2 Vertical Interface Diffusion Samplers 

Eight vertical interface diffusion sampling devices (diffusion chambers) were installed 
during barrier installation in 2004. Of these eight locations, one (DC 1-15) was installed 
south of the barrier and serves as a control location ( Figure 2-1 ). The groundwater 
diffusion chambers are designed to characterize groundwater at very small vertical 
intervals (<0.3 ft). The diffusion chamber apparatus consists of a PVC rack containing 
sampling bottles that is inserted vertically beneath the pond bottom within a hollow four- 
inch by four-inch square PVC post that is 3.0 ft in length. Each 60-milliliter sampling 
bottle has a 10-micron diffusion membrane sealing its opening. When placed in the 
vertical sub-pond bottom rack, the bottles are exposed to the aquifer through portholes in 
the PVC housing. Each sampler is filled with de-ionized water and allowed to equilibrate 
with the ambient groundwater. The rack can hold up to 13 sample bottles. To provide 
time for equilibration, the bottles are typically deployed for two to four weeks prior to 
sampling. The finished installation at the pond bottom consists of a flush-mounted 4-inch 
by 4-inch square stainless steel cap. 



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Results 

Diffusion samples collected in August 2006 were analyzed for field phosphate and SpC 
( Table 2 in Appendix A ). Figures 4a, 4b, and 4c in Appendix A present the vertical 
distribution of the field phosphate and SpC data collected between October 2004 and 
August 2006 for each of the eight diffusion samplers. A review of these figures indicates 
that field phosphate concentrations in the diffusion chambers located within the barrier 
generally decrease with shallower sampling depths in the barrier. Conversely, the field 
phosphate concentrations observed at the control location (DC 1-15) remained relatively 
high (> 1.0 mg/L) in all of the sampling intervals. These trends have remained relatively 
consistent at each of these diffusion chamber locations since sampling began in 2004. 

Based upon the SpC data presented in Figures 4a, 4b, and 4c in Appendix A , there is no 
evidence that the field phosphate results collected from the diffusion chambers have been 
diluted by the infiltration of pond water during sampling. None of the samples collected 
from the diffusion chambers during August 2006 yielded SpC values that were lower in 
the shallower samples than in the deeper (high phosphorus) samples. Consequently, the 
abrupt decreases in phosphorus concentrations observed in the shallower samples 
collected from the diffusion chambers, are thought to reflect phosphorus attenuation by 
the barrier. 

2.1.3 Horizontal Multiport Samplers 

Two horizontal multiport samplers (HMPS) were installed during construction of the 
geochemical barrier ( Figure 2-1 ). Each HMPS consists of two vertically stacked arrays 
of PVC pipe extending from the shoreline, pondward across the full width of the barrier. 
One PVC pipe in each HMPS was buried at a depth of 0.5 ft bpb (near the top of the 
barrier) and the other pipe in each HMPS is buried at a depth of 3.0 ft bpb (near the 
bottom of the barrier). Each pipe has an array of 15 sampling ports that are located 
progressively farther offshore. This design allows horizontal and vertical chemical 
profiles to be developed across the width of the barrier in both the northern and southern 
sections of the barrier. 



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Results 

Both HMPS were sampled in August 2006 for SpC, pH, DO, and field phosphate 
( Table 3 in Appendix A) . Figures 5a and 5b in Appendix A present the horizontal and 
vertical profiles for the SpC, pH, and dissolved phosphorus data collected in 2006. The 
deeper profiles (collected near the bottom of the barrier) at each HMPS illustrate the 
phosphorus concentrations, DO concentrations, and the SpC of groundwater just entering 
the barrier. Ideally, the shallower profiles should reflect changes to these parameters 
produced during the upward advection of the groundwater through the reactive barrier. 

A review of Figures 5a and 5b in Appendix A confirms that there is a general decrease in 
phosphorus concentrations between a depth of 3.0 ft and 0.5 ft bpb in both the northern 
and southern HMPS during the August 2006 sampling event. The SpC levels presented 
in these figures and the DO concentrations in Table 3 of Appendix A were evaluated for 
indications that contamination with pond water had diluted the phosphorus levels 
collected from the shallow sampling ports. There were no significant increases in the DO 
or significant decreases in SpC measurements with sampling depth in either the northern 
or the southern HMPS in the August 2006 data. The consistency of the DO and SpC data 
collected from the deeper and shallower intervals suggest that the reductions in the field 
phosphate concentrations observed in the upper part of the barrier are real, and were not 
produced by an influx of phosphorus-poor pond water during sampling. Consequently, 
the overall sampling results for the northern and southern HMPS support the general 
conclusion that phosphorus is being removed by the barrier. 

2.1.4 Deep Pond-Bottom Piezometers 

As part of the permanent monitoring network for the barrier, the USGS installed three 
piezometer clusters in 2004 (locations F633, F635, and F636) in the vicinity of the 
southern part of the barrier ( Figure 2-1) . Piezometer cluster (F633) is located at the mean 
shoreline of the pond, cluster F635 is located 55 ft off shore from the mean shoreline, and 
cluster F636 is located 110 ft from the mean shoreline ( Figure 2-1) . Each of these 
clusters contain four piezometers that extend, respectively, to depths of 10, 30, 60, and 
100 ft bpb. 



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Results 

All three of these pond-bottom piezometer clusters were sampled for selected field 
parameters, dissolved phosphorus, nitrate, and ammonium by the USGS in 2004, 2005, 
and 2006 ( Table 4 in Appendix A ). The August 2006 data from the deep piezometer 
clusters and July 2006 monitoring data from two upgradient multiport monitoring wells 
(F619 and F621) were used by the USGS to illustrate the vertical distribution of 
phosphorus, nitrate, and ammonium in groundwater migrating toward and beneath the 
pond along cross-section line A - A' ( Figure 2-1 , Figure 2-2 , Figure 2-3 , and Figure 2-4) . 
Similar to the findings of previous barrier performance evaluations, Figure 2-2 , 
Figure 2-3 , and Figure 2-4 suggest that most of the phosphorus-rich groundwater 
migrating toward the pond will eventually discharge to the pond within the footprint of 
the barrier while most of the nitrate and ammonium remaining in the WWTP plume is 
deeper in the aquifer and will discharge farther offshore than the footprint of the barrier. 
The deeper distribution of nitrate and ammonium relative to the phosphorus is consistent 
with greater vertical transport of these nitrogen compounds beneath the WWTP during 
the six decades that it was operating. 

2.1.5 Seepage Meters 

Eight permanent seepage meters were installed during barrier construction and were 
designed to enable chemical sampling of groundwater discharging to the pond and the 
measurement of the rate of discharge ( Figure 2-1 ). Each seepage meter consists of a 
three-foot-long section of a plastic barrel installed into the barrier until the upper edge 
was flush with the pond bottom. A plastic top that can be removed or tightly sealed as 
needed caps each seepage meter. Each seepage meter is 22 inches (55.9 centimeters) in 
diameter and covers an area of 0.245 square meters. Meters la and b are located outside 
and to the south of the barrier. Paired meters 2a and 2b, 3a and 3b, and 4a and 4b are 
located in the barrier at varying distances from shore ( Figure 2-1) . 



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Results 

All of the eight seepage meters were capped on 3 1 July 2006 and allowed to equilibrate 
for eight days. After equilibration, the flow rate through each meter was measured four 
times ( Table 5 in Appendix A) . Field phosphate was measured in the ground water 
discharging from each of the meters during at least one of the four flow measurement 
events. The flow rates and subsequent phosphorus flux rates are presented in Figure 8 of 
Appendix A . 

In general, the highest flow rates were measured in those seepage meters closest to the 
shoreline. Minimal phosphorus flux (a maximum rate of 7.3 milligrams per day [mg/d]) 
was measured in the meters located in the barrier area. The control site meters yielded 
phosphorus fluxes ranging from 154 to 318 mg/d ( Table 5 in Appendix A ). The lower 
phosphorus fluxes observed in the seepage meters installed in the barrier relative to the 
control seepage meters indicate that a large amount of the plume-related phosphorus load 
is being removed by the barrier. However, given the significant spatial variation in the 
flux rates of water through the barrier and the limited number of seepage meters that are 
installed, there are insufficient seepage meter data to reliably estimate the total mass of 
phosphorus being removed by the barrier. 

2.2 TEMPORARY DRIVE POINT SAMPLING 

During August 2006, the USGS collected approximately 200 temporary drive point 
samples at 76 locations to delineate the current distribution of phosphorus, inorganic 
nitrogen, and/or selected field parameters in ground water at 0.5, 1.5, and 3.0 ft bpb 
within or in the vicinity of the geochemical barrier ( Figure 2-5 ). Installation information 
for these temporary drive points is presented in Table 6 of Appendix A . The field 
parameters and chemical data collected from these locations are presented in Table 7 of 
Appendix A . 

The data collected at these drive point sampling locations were used by the USGS to 
produce digitized and colorized contour maps for the concentrations or values of the 
parameters of interest at each of the three sampling depth intervals (0.5, 1.5, 3.0 ft bpb). 
These contour maps and a location map for the drive points are incorporated in the 2006 



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USGS data summary letter ( Figures 9a through 9i of Appendix A ). For the convenience 
of the reader, a drive point location map and the relevant contour maps presented in 
Appendix A are also presented as Figure 2-5 , Figure 2-6 , Figure 2-7 , Figure 2-8 , 
Figure 2-9 , Figure 2-10 , Figure 2-11 , and Figure 2-12 of this TM. 

2.2.1 Phosphorus 

As previously discussed, achieving a notable reduction in the external phosphorus load to 
the pond is the primary remedial objective of the geochemical barrier. The barrier was 
located within that section of the plume footprint on the pond bottom where the most 
phosphorus-rich wastewater in the plume has historically been discharging ( Figure 1-2) . 

Results 

The elevated levels of phosphorus present in groundwater beneath the barrier (3.0 ft bpb) 
are not present within the barrier at a sampling depth of 0.5 ft bpb ( Figure 2-6 ). 
Conversely, elevated phosphorus concentrations remain at the 0.5 ft bpb sampling 
interval within a thin zone of the pond bottom located between the shoreline and the near- 
shore edge of the barrier ( Figure 2-6) . The extent of this thin zone as presented in 
Figure 2-6 , was further defined by the collection of field phosphate data from additional 
shallow (0.5 ft bpb) drive points installed between the shoreline and the near-shore edge 
of the barrier ( Figures 9a and 9f of Appendix A ). This thin zone of elevated phosphorus 
concentrations corresponds to that portion of the phosphorus plume that is discharging to 
the pond between the barrier and the shoreline. Figure 2-6 illustrates that the phosphorus 
concentrations in the wastewater plume discharging to the pond within the footprint of 
the barrier have been reduced by the barrier relative to the phosphorus concentrations in 
the wastewater plume discharging to the pond outside of the barrier footprint. 

The average phosphorus concentrations in samples collected within the phosphorus 
plume discharge area of the pond and within the footprint of the barrier at depths of 3.0 ft 
(just below the barrier) and 0.5 ft bpb (near the top of the barrier) were calculated for 
37 drive point surface locations ( Appendix C) . This procedure was repeated for the 
3.0 and 0.5 ft bpb samples collected from thirty surface locations within the discharge 
area of the phosphorus plume but outside the footprint of the barrier ( Appendix C ). The 



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average phosphorus concentrations in the 37 samples collected beneath the barrier (3.0 ft 
bpb) and near the top of the barrier (0.5 ft bpb) were calculated to be 0.89 mg/L and 
0.12 mg/L respectively, a reduction of approximately 87 percent of the phosphorus 
concentrations entering the barrier. Conversely, the average phosphorus concentrations 
for the 3.0 ft bpb and 0.5 ft bpb samples collected outside the barrier but within the 
footprint of the plume were 0.64 mg/L and 0.60 mg/L respectively, indicating essentially 
no reduction in phosphorus concentrations with decreasing depth. The higher absolute 
concentrations observed beneath the barrier at a depth of 3.0 ft bpb relative to the 
concentrations observed at 3.0 ft bpb outside the footprint of the barrier, reflects the fact 
that the barrier was installed within that part of the plume discharge area where the 
highest phosphorus values have historically been observed. 

2.2.2 Inorganic Nitrogen (Nitrate and Ammonium) 

A detailed trophic health investigation of Ashumet Pond conducted in 1999 found that 
Ashumet Pond was phosphorus limited over most of the growing season (AFCEE 2002a). 
Nevertheless, a high external load of inorganic nitrogen compounds (e.g., nitrate and 
ammonium) can be an important driver for cultural eutrophication processes in many 
freshwater and saltwater systems. For this reason, the potential of the geochemical 
barrier to reduce nitrogen concentrations in groundwater prior to discharging to the pond 
was evaluated and the concentrations of nitrate and ammonium in the groundwater within 
or in the vicinity of the barrier at depths of 0.5, 1.5, and 3.0 ft bpb are presented in 
Figure 2-7 and Figure 2-8 . 

Results 

Most of the inorganic nitrogen (e.g., nitrate and ammonium) in the wastewater plume is 
discharging to the pond farther offshore than the footprint of the barrier ( Figure 2-3 , 
Figure 2-4 , Figure 2-7 , and Figure 2-8 ). The highest concentrations of nitrate 
(>2.0 mg/L) detected by the network of temporary drive points were located just to the 
southeast of the outside edge of the barrier ( Figure 2-7) . Moderately elevated 
concentrations of nitrate were observed to extend beneath part of the barrier at a depth of 
3.0 ft bpb. However, these moderately elevated nitrate concentrations were not present in 



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shallower samples (e.g., at a depth of 0.5 ft bpb) collected from the interior of the barrier 
at the same surface locations. Conversely, much of the elevated nitrate concentrations 
observed outside the footprint of the barrier at a depth of 3.0 ft bpb remain present at a 
depth 0.5 ft bpb. This contrast in the distribution of nitrate with decreasing depth within 
the barrier relative to outside the barrier, indicates that the barrier is removing nitrate 
from groundwater ( Figure 2-7 ). The observed nitrate removal is likely related to the 
conversion of nitrate in the groundwater to nitrogen gas (N2) by denitrifying bacteria that 
have become established within the barrier. 

Figure 2-8 illustrates the distribution of ammonium within and in the vicinity of the 
barrier footprint. As with nitrate, the highest concentrations of ammonium are located 
outside the barrier footprint and moderately elevated concentrations are present beneath 
the barrier footprint at a depth of 3.0 ft bpb. Unlike nitrate, the moderately elevated 
levels of ammonium within the footprint of the barrier do not notably decrease at 
shallower depths (i.e., within the barrier), indicating that most of the ammonium is not 
being removed from groundwater by the barrier. 

2.2.3 Physico-Chemical (Field) Parameters 

Changes in groundwater SpC, DO, pH, and temperature in degrees centigrade with depth 
bpb within and in the vicinity of the barrier footprint are presented in Table 7 of 
Appendix A and in Figure 2-9 , Figure 2-10 , Figure 2-11 , and Figure 2-12 . A review of 
Table 7 of Appendix A and Figure 2-9 , Figure 2-10 , Figure 2-11 , and Figure 2-12 
indicate that the SpC and pH of groundwater increase as the groundwater migrates 
upward into, and interacts with, the barrier. DO concentrations in groundwater located 
just below the barrier are generally low (commonly 1.0 mg/L or less), owing to microbial 
processes in the wastewater-contaminated aquifer. Once the groundwater enters the 
barrier, these low DO concentrations are generally reduced to nondetect (< 0.1 mg/L) or 
near nondetect levels ( Figure 2-10 , and Table 7 in Appendix A) . Although the 
temperature of the groundwater increases between 3.0 and 0.5 ft bpb, this change in 
groundwater temperature is not limited to the area of the barrier footprint. The observed 
increases in temperature likely reflect the ability of shallow surface water to warm very 
shallow groundwater during the summer months. 



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3.0 AFCEE BARRIER CHEMISTRY AND POND SEDIMENT DATA 

Between 03 October and 05 October 2006, AFCEE collected groundwater from two 
depth intervals (mid-screen depths of 0.8 ft and 4.0 ft bpb) at each of five temporary drive 
point surface locations positioned within the barrier footprint and from two background 
locations positioned outside the barrier footprint ( Table 3-1 ; Figure 3-1 ). Groundwater 
quality data that was collected by AFCEE in 2005 from a third location outside the 
barrier footprint (95DPB0225) has also been included in Table 3-1 . In addition to the 
groundwater samples described above, AFCEE also collected surface sediment samples 
from six locations within the barrier and from seven locations outside of the barrier 
footprint ( Figure 3-1 ). Groundwater samples from the seven temporary drive point 
locations were analyzed for up to 15 groundwater quality parameters ( Table 3-1 ) and the 
13 sediment samples were analyzed for total iron, total phosphorus and total manganese 
concentrations ( Table 3-2) . These data were collected to identify the general 
geochemical changes in the wastewater-contaminated groundwater after it enters the 
barrier and to identify the probable mechanisms of phosphorus removal by the barrier. 

3.1 GROUNDWATER QUALITY RESULTS 

The changes to the general chemistry of groundwater migrating through the barrier have 
been evaluated by comparing the chemistry of the groundwater collected from within the 
barrier to the chemistry of groundwater collected from beneath the barrier and from three 
background locations outside the barrier footprint ( Table 3-1 ). The data presented in 
Table 3-1 indicate that the general chemistry of the wastewater-contaminated 
groundwater water collected from inside the barrier (mid-screen depth of 0.8 ft bpb) is 
chemically distinct from groundwater collected beneath the barrier (mid-screen depth of 
4 ft bpb) and from groundwater collected at the three background locations. Generally, 
the concentrations of dissolved iron, methane and alkalinity are higher within the barrier 
while the concentrations of dissolved sulfate and nitrate are much lower relative to 
samples collected beneath the barrier or from locations outside the barrier footprint. 
These changes in the groundwater chemistry are consistent with the development of 
highly reducing conditions and suggest that populations of denitrifying, sulfate reducing, 



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and methanogenic bacteria have developed within the barrier. The calcium and 
magnesium concentrations in the groundwater collected just beneath the barrier and 
within the upper foot of the barrier are not notably different ( Table 3-1 ). This suggests 
that precipitation of calcium carbonate within the barrier is minimal, despite the higher 
alkalinity and pH conditions that have developed within parts of the barrier ( Table 3-1 ; 
Figure 2-11) . Consequently, precipitation of calcium carbonate does not appear to be 
contributing to a reduction in the permeability of the barrier as has been observed to 
occur in some other ZVI barriers (Furukawa et al. 2002; Li et al. 2005). 

The shallow sample (0.8 ft bpb) collected from background location 95DP3008 shows 
many of the same depth-related changes in chemical characteristics (e.g., increased iron 
and methane and decreased sulfate concentrations) that were observed in the shallow 
samples collected from the locations within the barrier footprint ( Table 3-1) . 
Furthermore, background location 95DP3008 is the only location sampled in 2006 that 
shows a notable reduction in the concentrations of calcium and magnesium (suggesting 
calcium carbonate precipitation) between a mid-screen depth of 4.0 and 0.8 ft bpb 
( Table 3-1 ). The proximity of this background location to the barrier footprint 
( Figure 3-1) suggests that the groundwater collected at 0.8 ft bpb at 95DP3008 has been 
affected by the close proximity of the barrier and that it is not representative of true 
background conditions. 

3.2 POTENTIAL PHOSPHORUS REMOVAL MECHANISMS 

The concentrations of total dissolved phosphorus (TDP) in the AFCEE groundwater 
samples collected within the barrier are notably lower than the concentrations in samples 
collected immediately below the barrier ( Table 3-1 ). These data are consistent with the 
2006 USGS barrier performance data ( Figure 2-6 ; Appendix A ) and further support the 
inference that phosphorus removal is occurring within the barrier. 

Unaltered ZVI has little or no direct capability to adsorb or otherwise remove dissolved 
phosphorus (phosphate) from groundwater. When ZVI is exposed to oxygenated 
groundwater or surface water, however, it will be oxidized by oxygen to the ferric (3 + ) 



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state, resulting in the precipitation of ferrihydrite (Fe(OH)3) or other highly insoluble 
ferric hydroxide compounds with a high affinity and sorption capacity for dissolved 
phosphorus (Clayton et al. 2004). Under anoxic conditions, ZVI will react with water 
resulting in the production of hydrogen gas by the reduction of water and of ferrous (2 + ) 
iron by the oxidation of the ZVI. Ferric iron is not stable in such a highly reducing 
anoxic system and consequently, ferric hydroxides are unlikely to precipitate. 

As previously discussed, most of the phosphorus-rich groundwater entering the bottom of 
the Ashumet Pond ZVI barrier contains DO concentrations of only about 1.0 mg/L or less 
and the groundwater appears to be deoxygenated very rapidly upon reaching the barrier. 
Groundwater samples collected in 2006 ( Table 3-1 ) confirm that highly reducing 
(methanogenic and sulfate reducing) conditions are present in the interior of the barrier. 
Given the existence of such highly reducing conditions within the barrier, ferric 
hydroxides, or other fully-oxidized iron compounds are unlikely to be a major component 
of the corrosion assemblage that has developed. Consequently, sorption of phosphorus 
by ferric iron hydroxides is probably not a significant mechanism of phosphorus removal 
in the interior of the barrier. Rather, the highly reducing conditions and elevated 
concentrations of ferrous iron in the barrier suggest that the precipitation of vivianite 
(Fe3 (PC>4)2.8H20) may be producing the observed reductions in phosphorus 
concentrations within the barrier. Vivianite is known to form in phosphorus and iron rich 
sediments under anaerobic conditions (Hearn et al. 1983; Emerson and Widmar 1978) 
and it has been observed to precipitate on the surfaces of mild (unalloyed) steel during 
laboratory investigations of microbially-mediated corrosion reactions (Volkland et al. 
2000) and on the surfaces of ZVI in column studies where the influent contained elevated 
concentrations of dissolved phosphate (Wust et al. 1998). Phosphorus removal within the 
barrier may also reflect the formation of green rust, a layered, anion exchanging Fe(II)- 
Fe(III)-double hydroxide that is a common corrosion product in ZVI barriers (Furukawa 
et al. 2002). Green rust is known to sorb phosphate and ultimately to facilitate the 
formation of vivianite in ferrous iron-rich systems (Hansen and Poulsen 1999). 



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3.3 SEDIMENT RESULTS 

As part of the October 2006 sampling event, AFCEE collected six surface sediment 
samples (generally the top inch of sediment) from within the barrier footprint and from 
seven locations located northeast and southwest of the barrier ( Figure 3-1 ). Five of the 
six sediment samples collected within the barrier footprint were collected at the five 
AFCEE drive point locations discussed in Section 3.1 ( Figure 3-1 ). During collection, all 
samples were screened with a number 4 mesh screen to remove all material coarser than 
4.75 millimeters and analyzed for total iron, total manganese and total phosphorus 
( Table 3-2 ). The sediment data were used to: (1) determine whether the oxidized iron- 
rich surface layer of the barrier is sequestering phosphorus; (2) evaluate the extent that 
iron-rich sediments have migrated outside the footprint of the barrier. 

Surface sediment samples collected inside the barrier footprint ( Figure 3-1 ; Table 3-2) 
consisted of a mixture of gravelly, fine- to coarse-grained dark brown to gray colored 
sand with a patina of reddish brown oxidized iron at the interface with the overlying pond 
water. Surface sediment samples collected outside of the barrier footprint consisted of 
variable mixtures of gravelly, fine- to coarse-grained reddish-brown to tan colored sand. 
Iron concentrations in the six barrier sediment samples were much higher than the 
samples collected outside the barrier and ranged from 23,000 to 130,000 milligrams per 
kilogram (mg/kg). The iron concentrations in the four samples collected south of the 
barrier footprint ranged from 380 to 4,700 mg/kg and the three samples collected north of 
the barrier footprint ranged from 2,100 to 18,000 mg/kg ( Table 3-2 ). Only two sample 
locations (95SE0016 and 95SE0017) outside the barrier contained iron concentrations 
that were notably higher than the average iron concentrations (2,126 mg/kg) from 
ten shallow sediment samples (0 to 1 foot bpb) collected from the area prior to 
installation of the barrier (AFCEE 2005). Both of the northern samples with elevated 
iron concentrations were located within 100 ft of the northern edge of the barrier 
( Figure 3-1 ). Comparison of the iron concentrations in those samples collected inside the 
barrier footprint to those collected outside the barrier footprint suggests that long shore 
transport of iron hydroxide coated sand outside the barrier footprint has been relatively 
limited since barrier installation in 2004. 



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The very low total phosphorus concentrations in the surface sediments collected within 
the footprint of the barrier (95SE0009 through 95SE3015) are consistent with the 2006 
USGS and AFCEE drive point data that indicate that most phosphorus in the groundwater 
beneath the barrier footprint is removed prior to reaching the upper few inches of the 
barrier. Conversely, the two samples collected north of the barrier footprint that 
contained relatively elevated iron concentrations (95SE0016 and 95SE0017), also 
contained the highest phosphorus concentrations detected in any of the samples collected 
in or out of the barrier footprint. The elevated levels of phosphorus in these two locations 
suggests that the oxidized iron-coated sand transported outside of the barrier footprint but 
still within the phosphorus plume discharge area, has continued to remove phosphorus 
from discharging groundwater or possibly from the overlying pond surface water. 



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4.0 SUMMARY AND CONCLUSIONS 

The 2006 barrier performance data collected from the USGS permanent monitoring 
network and from approximately 200 temporary drive point locations indicate that the 
barrier is continuing to effectively remove phosphorus from that part of the wastewater 
plume discharging to the pond through the barrier footprint and thus, reducing the 
external phosphorus load to the pond. 

Most of the inorganic nitrogen (e.g., nitrate and ammonium) in the wastewater plume is 
discharging to the pond farther offshore than the footprint of the barrier. Nevertheless, 
Figure 2-7 indicates that moderately elevated concentrations of nitrate were observed in 
drive point samples collected from beneath (i.e., 3.0 ft bpb) part of the barrier. The 
moderately elevated concentrations of nitrate in groundwater immediately beneath the 
barrier were reduced to essentially non detectable concentrations in groundwater that had 
migrated into the barrier. Conversely, Figure 2-7 suggests that much of the elevated 
nitrate concentrations observed outside the footprint of the barrier at a depth of 3.0 ft bpb 
largely remained present at a depth 0.5 ft bpb. This contrast in the vertical distribution of 
nitrate within the footprint of the barrier relative to outside the barrier, suggests that a 
population of denitrifying bacteria has developed within the barrier and is converting 
nitrate in the groundwater passing through the barrier to nitrogen gas (N2). Unlike 
nitrate, the moderately elevated levels of ammonium beneath the barrier do not notably 
decrease at shallower depths (i.e., after entering the barrier). 

Changes in groundwater SpC, pH, DO, and temperature with depth bpb within and in the 
vicinity of the barrier footprint were examined. The data indicate that SpC and pH 
generally increase as the groundwater migrates upward into the barrier while DO 
concentrations typically decline to nondetect (< 0.1 mg/L) or near nondetect levels. The 
temperature of the groundwater increases between 3.0 and 0.5 ft bpb. However, this 
change in groundwater temperature is not limited to the area of the barrier footprint and is 
attributed to conductive warming of very shallow groundwater during the summer by the 
proximity of warm surface water. 



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Groundwater samples collected in 2006 confirm that sulfate reducing and methanogenic 
conditions are present in the interior of the barrier. Such highly reducing conditions 
within the barrier suggest that ferric hydroxides are probably not a major component of 
the corrosion assemblage and sorption of phosphorus by ferric iron hydroxides is 
probably not a significant mechanism of phosphorus removal in the barrier. Rather, the 
highly reducing conditions and elevated concentrations of dissolved iron in the barrier 
suggest that the formation of the ferrous iron phosphate mineral vivianite 
(Fe3 (P04)2.8H20) and/or green rust may be the primary phosphorus removal 
mechanisms within the barrier. 

Low levels of phosphorus in the oxidized iron-rich surficial sediment collected within the 
barrier footprint support the conclusion that phosphorus is being removed from 
groundwater before it reaches the top of the barrier and discharges to the overlying pond. 
The elevated iron concentrations present in the upper inch of sediment at two of the 
sample locations north of the barrier footprint suggest that current and wave action has 
carried some oxidized iron-coated sand outside the original footprint of the barrier. The 
relatively elevated phosphorus levels in the shallow sediments collected from these two 
locations suggest that this oxidized iron-rich material is continuing to remove phosphorus 
from groundwater discharging to the pond or from the overlying pond water. 



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5.0 FUTURE MONITORING 

During 2007 the USGS will collect groundwater samples for the analysis of TDP and 
flow measurements from the permanent monitoring network. USGS or AFCEE will also 
collect: (1) core samples from one background location and from three locations within 
the barrier for mineralogical analysis and chemical analysis of total iron, total manganese 
and total phosphorus; and (2) groundwater samples from six temporary drive point 
locations (two background and four barrier locations). Each temporary drive point 
location will be sampled at two mid-screen depths (e.g., 3.5 ft and 0.8 ft bpb) and each 
sample will be analyzed for dissolved iron, manganese, sulfate, nitrate, ammonium, 
chloride, calcium, magnesium, sodium, phosphorus, DO, alkalinity, methane, and field 
parameters. The data collected during 2007 will be used to conduct geochemical 
modeling of the background and barrier-treated groundwater in order to identify the 
phosphorus-removal mechanisms in the barrier and to evaluate the potential for long-term 
barrier effectiveness. 



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6.0 REFERENCES 



Air Force Center for Environmental Excellence (AFCEE). 2006 (April). Final Ashumet 
Pond 2005 Phosphorus Barrier Technical Memorandum. 337105-SPEIM- 
ASHPO-TECHMEM-00L Prepared by CH2M HILL for AFCEE/MMR 
Installation Restoration Program, Otis ANG Base, MA. 

. 2005 (April). Ashumet Pond Geochemical Barrier for Phosphorus Removal 

Installation Summary Report. 176585-SPEIM-ASHPO-RPT-001. Prepared by 
CH2M HILL for AFCEE/MMR Installation Restoration Program, Otis ANG 
Base, MA. 

. 2004 (August). Final Ashumet Pond Geochemical Barrier Phosphorus Removal 

Design Testing & Installation Workplan. 176585-SPEIM-ASHPO-WRKPLN- 
002. Prepared by CH2M HILL for AFCEE/MMR Installation Restoration 
Program, Otis ANG Base, MA. 

. 2002a (February). Final Ashumet Pond Trophic Health Technical Memorandum. 

AFC-J23-35S18402-M17-0012. Prepared by Jacobs Engineering Group Inc. for 
AFCEE/MMR Installation Restoration Program, Otis ANG Base, MA. 

. 2002b (February). Ashumet Pond Phosphorus Inactivation Report. F41624-00- 

D-8021. Prepared by CH2M HILL for AFCEE/MMR Installation Restoration 
Program, Otis ANG Base, MA. 

. 2001 (August). Final Ashumet Pond Phosphorus Management Plan. AFC-J23- 

35S18402-M17-0011. Prepared by Jacobs Engineering Group Inc. for 
AFCEE/MMR Installation Restoration Program, Otis ANG Base, MA. 

Clayton, M.E., Liegeois, S. and Brown, E.J., 2004. Phosphorus Sequestration in Lake 
Sediment with Iron Mine Tailings. Soil and Sediment Contamination, vol. 13: pp 
412-429. 

Emerson, Steven and Widmar, Gerhard. 1978. Early diagenesis in anaerobic lake 
sediments II. Thermodynamic and kinetic factors controlling the formation of iron 
phosphate. Geochemica et Cosmochimica, vol. 42, Issue 9, pp. 1307-1316. 

Furukawa, Y., Kim, J., Watkins, J., and Wilkin, R.T., 2002. Formation of Ferrihydrite 
and Associated Iron Corrosion Products in Permeable Reactive Barriers of Zero- 
Valent Iron. Environmental Science & Technology, 36, pp. 5469-5475. 

Hansen, H.C.B., and Poulsen, I.F., 1999. Interaction of synthetic sulphate "green rust" 
with phosphate and the crystallization of vivianite. Clays and Clay Mineralogy, 
47, pp. 312-318. 



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Hearn, P.P., Parkhurst, David, L., and Callender, E., 1983. Authigenic vivianite in 
Potomac River sediments; control by ferric oxy-hydroxides. Journal of 
Sedimentary Research; March 1983; v.53; no. 1; p, 165-177. 

K-V Associates, Inc. 1991. Ashumet Pond, Falmouth/Mashpee, Massachusetts—A 
Diagnostic/Feasibility Study: Falmouth, Mass., K.V. Associates and IEP, Inc., 
158 p. 

Li, Lin, Benson, Benson, Craig H., Lawson, Elizabeth M. 2005. Impact of Mineral 
Fouling on Hydraulic Behavior of Permeable Reactive Barriers Ground Water 
43 (4), 582-596. 

McCobb, Timothy D. 2003. Determination of the Discharge Area and Nutrient Flux 
from a Sewage Plume to a Glacial-Kettle Pond on Cape Cod, Massachusetts. 
Geological Society of America Abstracts with Programs, Vol. 35, No. 6, 
September 2003, p.50. 

McCobb, Timothy D., LeBlanc, Denis R., Walter, Donald A., Hess, Kathryn M., Kent, 
Douglas B., and Smith Richard L. 2003. Phosphorus in a Ground- Water 
Contaminant Plume Discharging to Ashumet Pond, Cape Cod, Massachusetts, 
1999. USGS Water-Resources Investigations Report 02-4306. 

Volkland, Hans-Peter Harms, Hauke, Muller, Beat, Repphun, Gemot, Wanner, Oskar and 
Zehnder, Alexander J. B., 2000. Bacterial Phosphating of Mild (Unalloyed) Steel. 
Applied and Environmental Microbiology, Vol. 66, No. 10. pp. 4389-4395. 

Walter, D.A., B.A. Rea, K.G. Stollenwerk, and J. Savoie. 1995. Geochemical and 
Hydrologic Controls on Phosphorus Transport in a Sewage-Contaminated Sand 
and Gravel Aquifer Near Ashumet Pond, Cape Cod, Massachusetts. U.S. 
Geological Survey Water Resources Investigations Report 95-381. 

Wust, W., Schlicker, O., and Dahmke, A., 1998. Degradation of TCE at Zero-Valent 
Iron: Chemical Processes Affecting the Design and Performance of Permeable, 
Reactive Fe(0) Walls. In: NATO/CCMS Pilot Study. Evaluation of Demonstrated 
and Emerging Technologies for the Treatment of Contaminated Land and 
Groundwater (Phase II). Special Session on Treatment Walls and Permeable 
Reactive Barriers. 



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3/21/2007 



APPENDIX A 
U.S. Geological Survey 2006 Barrier Performance Report 



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Massachusetts-Rhode Island Water Science Center 

10 Bearfoot Road 

Northborough, MA 01532 

(508) 490-5016 

(508) 490-5068 (fax) 

tmccobb @ usgs.gov 

November 14, 2006 

Jon Davis 

AFCEE/MMR/IRP 

318 East Inner Road 

Otis ANG Base, MA 02542 

Dear Jon, 

During the period of August 3-21, 2006, the U.S. Geological Survey collected 
water samples from all permanent monitoring sites at the Ashumet Pond geochemical 
barrier and from 200 temporary pond-bottom drive points as part of continuing 
monitoring of the barrier's performance ( fig. 1 and fig. 2 ). Enclosed are the field and 
laboratory results from samples collected from the pond-bottom piezometers, vertical and 
horizontal multiport samplers, vertical diffusion samplers, seepage meters, and temporary 
drive points. The purpose of this sampling round was to monitor the phosphorus plume 
prior to and as it passed through the zero-valent-iron barrier and to map the current 
concentrations of the phosphorus plume at three depths in the area of the barrier. These 
data will be compared to results from the pre-barrier (July 2004) and three post-barrier 
(October 2004, April 2005, and July 2005) sampling rounds (reported in letters dated 
12/13/04, 7/21/05, and 9/26/05) to assess the long-term performance of the barrier. 

Phosphorus concentrations in the water samples were measured in the field and 
laboratory. The field analyses were made on unfiltered samples with a colorimetric 
method that measures orthophosphate and are reported herein as phosphate 
concentrations. The laboratory analyses were made on filtered and acidified samples 
with an alkaline persulfate digestion method that measures total dissolved phosphorus 
and are reported herein as phosphorus concentrations. Because most phosphorus in the 
plume is present as orthophosphate, the two methods give similar results. 

In general, the field and laboratory results indicate that phosphorus concentrations 
continue to be reduced as ground water flows through the geochemical barrier. Vertical 
samplers (multilevel and diffusion) measured phosphorus as great as 1.6 mg/L in the 
deepest ports below the barrier. At shallower depths within the barrier, phosphorus 
concentrations were reduced to undetectable values. The results from the horizontal 
multiport samplers (HMPS) show the continued presence of phosphate below the barrier, 



with the highest concentrations near the shoreline. At the shallow HMPS within the 
barrier, phosphate was measured above 0.40 mg/L (as P) in only one sampling port. The 
results from the pond-bottom piezometers indicate little change in the distribution of 
phosphorus at depths greater than 10 feet below the pond bottom. However, the 
concentrations of the nitrogen species in the piezometers have decreased substantially in 
the past 13 months. 

The stage of Ashumet Pond (46.15 ft on 8/9/06) was greater than 2 feet above 
mean stage for most of the summer months. With the higher-than-average stage, the 
phosphorus discharge area has temporarily shifted landward. This shift is most evident in 
the results from the temporary points driven into the pond bottom in and near the 
geochemical barrier. 

I have included a brief description of each of the sampling methods and notable 
observations made during this sampling event: 

Vertical Multilevel Samplers 

Each of the 10 vertical multilevel samplers (MLS) consists of five sampling ports 
screened at 0, 0.8, 1.6, 2.2, and 3.4 feet below the pond bottom. The deepest interval 
(3.4 ft) is positioned to sample ground water below the geochemical barrier. MLS sites 
are located within the barrier and outside (pondward or to the south) of the barrier 
( fig. 2 ). The field and laboratory results from the pre- (July 2004), postl- (October 2004), 
post2- (April 2005), and post3- (July 2005) sampling rounds are shown in table 1 . 
Figures 3a-j show temporal changes in profiles of specific conductance, dissolved 
oxygen, and phosphorus for the four or five (partial round in April 2005) sampling dates. 

Vertical Diffusion Samplers 

A diffusion chamber is a vertical stack of 13 bottles filled with deionized water 
and having open tops that are covered with a 10-|LLm mesh. This stack of bottles is 
inserted into a PVC casing that was permanently installed in the pond bottom during the 
barrier installation. After about 2 weeks of equilibration time in the pond bottom, the 
bottles are harvested, and specific conductance and field phosphate are measured. The 
results from all sampling rounds are shown in table 2 . Figures 4a-c show the vertical 
distributions of specific conductance and phosphate for each of the eight diffusion 
sampling sites. Figures 4a-c also show the thickness of the iron zone (for August 2006) as 
indicated visually by reddish brown or gray film on the sample bottles. 

Horizontal Multiport Samplers 

Horizontal multiport samplers (HMPS) consist of 15 sampling tubes that extend 
pondward from shore to various distances from shore. These samplers were buried in the 
pond bottom at two depths (0.5 and 3.0 feet below the pond bottom) during installation of 
the geochemical barrier. Two coupled horizontal multiport samplers (a total of four) were 
used at Ashumet Pond (lines 1 and 2, fig. 2) . Results from all sampling rounds are shown 
in table 3 . Figures 5a and 5b show horizontal transects of specific conductance, pH, 
dissolved oxygen, and phosphate for August 2006. Figures 6a and 6b show the horizontal 
profiles for specific conductance and phosphate for the October 2004, July 2005, and 



August 2006 sampling rounds. In general, elevated phosphate is present in the deep 
HMPS at each location (lines 1 and 2) and is absent or very low at the shallow sampler 
after the ground water has passed through the barrier. The HMPS also show a shift in 
location (towards shore) of the discharge footprint owing to the rise in pond stage. 

Pond-Bottom Piezometers 

Twelve pond-bottom piezometers extending as deep as 100 feet were sampled as 
part of the August 2006 sampling round. Piezometer clusters at the shoreline (F633), 
55 feet from mean shoreline (F635), and 1 10 feet from mean shoreline (F636) were 
sampled at depths of 10, 30, 60, and 100 feet below the pond bottom. Results from the 
sampling (and previous sampling rounds) are shown in table 4 and figures 7a-c . In 
figures 7a-c , the phosphorus and nitrogen results from the piezometer sampling were 
combined with data (July 2006) from upgradient wells to produce the vertical sections. 

Seepage Meters 

Eight permanent seepage meters were measured on August 8, 2006 ( fig. 2 ). 
Meters la and b are located outside and to the south of the barrier. Paired meters 2a and 
2b, 3a and 3b, and 4a and 4b are located in the barrier at varying distances from shore. 
Each meter was capped on July 31 and allowed to equilibrate for 8 days. The flow rate 
through each meter was measured for four measurement trials ( table 5 ). Field 
orthophosphate was measured in the discharging ground water on at least one trial from 
each meter. The flow rates and subsequent phosphorus flux rates are graphed in figure 8 . 
In general, the highest flow rates were measured in meters closest to the shoreline. 
Minimal phosphorus flux (a maximum rate of 7.3 mg/d) was measured in the meters 
located in the barrier area. The control site meters yielded phosphorus fluxes ranging 
from 154 to 318 mg/d. 

Temporary Pond-Bottom Drive Points 

During August 3-21, 2006, 200 temporary drive points were installed at 76 
locations to delineate the current distribution of phosphorus and nitrogen in ground water 
at 0.5, 1.5, and 3.0 feet below the pond bottom in the area of the geochemical barrier 
( fig. 9a ). The field and laboratory results are tabulated in table 6 and table 7 . Figures 9b-i 
show the distributions of specific conductance, dissolved oxygen, pH, temperature, field 
phosphate, phosphorus, nitrate, and ammonium at the three depth intervals. The maps 
were generated from digitized contours using GIS to interpolate concentration values and 
then colorize by value. Figure 9g shows a decrease in phosphorus at progressively 
shallower depths in the barrier below the pond bottom. Average phosphorus 
concentrations over the area of the geochemical barrier, as determined using GIS, are 
0.24, 0.28, and 1.01 mg/L for the 0.5-, 1.5- and 3.0-ft sampling depths, respectively. 



Please contact me by phone (508-490-5016) or via email at tmccobb@usgs.gov if you 
have any questions about the monitoring network or the results from the August 2006 
sampling round. A compact disc (CD) with the electronic versions of all tables and 
figures has been enclosed with this letter. 

Sincerely yours, 

Timothy D. McCobb 
Hydrologist 



cc: Jonathan Blount, CH2MHILL 



APPENDIX B 

Comparison of Field- and Laboratory-Determined 
Phosphorus Concentrations 



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2.0 



E 

c 



All DATA 

(Shows lab values < MRL = or estimated value and 
field values < 0.24 = meter readout) 



REPORTING LIMIT, 
LABORATORY = 
0.02 mg/L as P 




DETECTION LIMIT, 

FIELD METHOD = 

0.24 mg/L as P 



DATA GREATER THAN DETECTION/REPORTING LIMITS 

(Shows lab values > MRL (0.02 mg/L as P) and 
field values > method detection limit (0.24 mg/L as P)) 



REPORTING LIMIT, 
LABORATORY = 
0.02 mg/L as P 




DETECTION LIMIT, 

FIELD METHOD = 

0.24 mg/L as P 



0.5 1.0 1.5 

DISSOLVED PHOSPHORUS (USGS NWQL), 
in mg/L as P 



2.0 0.0 



0.5 1.0 1.5 

DISSOLVED PHOSPHORUS (USGS NWQL), 
in mg/L as P 



2.0 



Comparison of field- and laboratory-determined phosphorus concentrations in pond-bottom ground water sampled 
in August 2006, Ashumet Pond, MA 



I ■'..,■ -J,-. « I-. ■„■.,, ■,.!.,■ ., 



APPENDIX C 

Statistical Comparison of Phosphorus Concentrations vs. 
Depth in Barrier and Background Locations 



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337105-SPEIM-ASHPO-TECHMEM-002 

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Appendix C 

Statistical Comparison of Phosphorus Concentrations vs. 

Depth in Barrier and Background Locations 

Final Ashumet Pond 2006 Phosphorus Barrier Technical Memorandum 



Inside Barrier 


Inside Barrier 


Inside Barrier 


Inside Barrier 


0.5 ft bpb 


0.5 ft bpb 


3.0 ft bpb 


3.0 ft bpb 


Phosphorus, 


Phosphorus, 


Phosphorus, 


Phosphorus, 


Dissolved 


Dissolved 


Dissolved 


Dissolved 


(mq/L) 


(mq/L) 


(mq/L) 


(mq/L) 


Mean 


0.12 


Mean 


0.89 


Standard Error 


0.02 


Standard Error 


0.08 


Median 


0.09 


Median 


0.73 


Mode 


0.02 


Mode 


1.50 


Standard Deviation 


0.10 


Standard Deviation 


0.50 


Sample Variance 


0.01 


Sample Variance 


0.25 


Kurtosis 


1.96 


Kurtosis 


-1.60 


Skewness 


1.56 


Skewness 


0.10 


Range 


0.39 


Range 


1.58 


Minimum 


0.01 


Minimum 


0.11 


Maximum 


0.40 


Maximum 


1.69 


Sum 


4.26 


Sum 


33.01 


Count 


37.00 


Count 


37.00 



Outside Barrier 


Outside Barrier 


Outside Barrier 


Outside Barrier 


0.5 ft bpb 


0.5 ft bpb 


3.0 ft bpb 


3.0 ft bpb 


Phosphorus, 


Phosphorus, 


Phosphorus, 


Phosphorus, 


Dissolved 


Dissolved 


Dissolved 


Dissolved 


(mg/L) 


(mg/L) 


(mg/L) 


(mg/L) 


Mean 


0.60 


Mean 


0.64 


Standard Error 


0.08 


Standard Error 


0.07 


Median 


0.45 


Median 


0.53 


Mode 


0.19 


Mode 


0.36 


Standard Deviation 


0.42 


Standard Deviation 


0.38 


Sample Variance 


0.17 


Sample Variance 


0.15 


Kurtosis 


-1.19 


Kurtosis 


-1.31 


Skewness 


0.44 


Skewness 


0.41 


Range 


1.30 


Range 


1.16 


Minimum 


0.02 


Minimum 


0.14 


Maximum 


1.32 


Maximum 


1.30 


Sum 


18.08 


Sum 
| Count 


19.11 


Count 


30.00 | 


30.00 



Notes: 

Censored data used in the statistical analysis excludes all locations with ND data or with 
phosphorus concentrations equal to or less than 0.1 mg/L at a depth of 3.0 feet. ND or "less 
than" data at 0.5 feet in remaining locations was converted to the numeric value of the detection 
limit. 

ft bpb = feet below the pond bottom 
mg/L = milligrams per liter 



\\Mmrfs01\ch2m\Projects\337105\Technical Services\Ashumet PondVTech Memoranda\Barrier data_Tech memos\ 
2006 Barrier report\Appendix C (Stats)\Statistics Appendix C.xls ^ , , , 

3/5/2007 Page 1 of 1 




Figure 1. Area of the geochemical barrier and extent of the discharge area of the 
phosphorus plume at Ashumet Pond in June 2003. 




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Figure 2. Locations of permanent seepage meters, vertical multilevel samplers, horizontal multiport 
samplers, and vertical diffusion samplers in the geochemical barrier at Ashumet Pond. 



Site FSW 639-P01 




0.0 0.5 1.0 1.5 2.0 

PHOSPHORUS, 
in milligrams per liter as P 



2.5 3.0 50 100 150 200 250 300 1 2 3 4 5 6 7 8 9 10 

SPECIFIC CONDUCTANCE, DISSOLVED OXYGEN, 

in microsiemens per centimeter in milligrams per liter 



Figure 3a. Geochemical profiles from pond-bottom vertical multilevel samplers, including dissolved phosphorus, 
specific conductance, and dissolved oxygen, prior to installation of the geochemical barrier (July 2004), and at 
2 (October 2004), 1 1 (July 2005), and 23 months (August 2006) after installation of the geochemical barrier. 



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0.0 0.5 1.0 1.5 2.0 2.5 3.0 50 

PHOSPHORUS, 
in milligrams per liter as P 



100 150 200 250 

SPECIFIC CONDUCTANCE, 
in microsiemens per centimeter 



Pond 



Pond Bottorri 



August 2006 




July 2005 



300 1 2 3 4 5 6 7 8 9 10 

DISSOLVED OXYGEN, 
in milligrams per liter 



Figure 3g. Geochemical profiles from pond-bottom vertical multilevel samplers, including dissolved phosphorus, 
specific conductance, and dissolved oxygen, prior to installation of the geochemical barrier (July 2004), and at 
2 (October 2004), 11 (July 2005), and 23 months (August 2006) after installation of the geochemical barrier. 



Site FSW 639-P01 




0.0 0.5 1.0 1.5 2.0 

PHOSPHORUS, 
in milligrams per liter as P 



2.5 3.0 50 100 150 200 250 300 1 2 3 4 5 6 7 8 9 10 

SPECIFIC CONDUCTANCE, DISSOLVED OXYGEN, 

in microsiemens per centimeter in milligrams per liter 



Figure 3a. Geochemical profiles from pond-bottom vertical multilevel samplers, including dissolved phosphorus, 
specific conductance, and dissolved oxygen, prior to installation of the geochemical barrier (July 2004), and at 
2 (October 2004), 1 1 (July 2005), and 23 months (August 2006) after installation of the geochemical barrier. 



IUSGS 

sc/mce far a changing world 



Site FSW 639-P01 




0.0 0.5 1.0 1.5 2.0 

PHOSPHORUS, 
in milligrams per liter as P 



2.5 3.0 50 100 150 200 250 300 1 2 3 4 5 6 7 8 9 10 

SPECIFIC CONDUCTANCE, DISSOLVED OXYGEN, 

in microsiemens per centimeter in milligrams per liter 



Figure 3a. Geochemical profiles from pond-bottom vertical multilevel samplers, including dissolved phosphorus, 
specific conductance, and dissolved oxygen, prior to installation of the geochemical barrier (July 2004), and at 
2 (October 2004), 1 1 (July 2005), and 23 months (August 2006) after installation of the geochemical barrier. 



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0.0 0.5 1.0 1.5 2.0 2.5 3.0 50 100 150 200 250 300 1 2 3 4 5 6 7 8 9 10 

PHOSPHORUS, SPECIFIC CONDUCTANCE, DISSOLVED OXYGEN, 

in milligrams per liter as P in microsiemens per centimeter in milligrams per liter 



Figure 3b. Geochemical profiles from pond-bottom vertical multilevel samplers, including dissolved phosphorus, 
specific conductance, and dissolved oxygen, prior to installation of the geochemical barrier (July 2004), and at 
2 (October 2004), 11 (July 2005), and 23 months (August 2006) after installation of the geochemical barrier. 



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0.0 0.5 1.0 1.5 2.0 

PHOSPHORUS, 
in milligrams per liter as P 



2.5 3.0 50 100 150 200 250 

SPECIFIC CONDUCTANCE, 
in microsiemens per centimeter 



300 1 2 3 4 5 6 7 8 9 10 

DISSOLVED OXYGEN, 
in milligrams per liter 



Figure 3c. Geochemical profiles from pond-bottom vertical multilevel samplers, including dissolved phosphorus, 
specific conductance, and dissolved oxygen, prior to installation of the geochemical barrier (July 2004), and at 
2 (October 2004), 11 (July 2005), and 23 months (August 2006) after installation of the geochemical barrier. 



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0.0 0.5 1.0 1.5 2.0 

PHOSPHORUS, 
in milligrams per liter as P 



Pond 



Pond Bottom 



Oct 2004 



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Pond 



July 2004 




Pond Bottom 



July 2005 



2.5 3.0 50 100 150 200 250 

SPECIFIC CONDUCTANCE, 
in microsiemens per centimeter 



300 1 2 3 4 5 6 7 8 9 10 

DISSOLVED OXYGEN, 
in milligrams per liter 



Figure 3d. Geochemical profiles from pond-bottom vertical multilevel samplers, including dissolved phosphorus, 
specific conductance, and dissolved oxygen, prior to installation of the geochemical barrier (July 2004), and at 
2 (October 2004), 1 1 (July 2005), and 23 months (August 2006) after installation of the geochemical barrier. 



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0.0 0.5 1.0 1.5 2.0 2.5 

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in milligrams per liter as P 



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Pond Bottom 



3.0 50 100 150 200 250 300 1 2 3 4 5 6 7 8 9 10 

SPECIFIC CONDUCTANCE, DISSOLVED OXYGEN, 

in microsiemens per centimeter in milligrams per liter 



Figure 3e. Geochemical profiles from pond-bottom vertical multilevel samplers, including dissolved phosphorus, 
specific conductance, and dissolved oxygen, prior to installation of the geochemical barrier (July 2004), and at 
2 (October 2004), 11 (July 2005), and 23 months (August 2006) after installation of the geochemical barrier. 



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0.0 0.5 1.0 1.5 2.0 2.5 3.0 50 100 150 200 250 300 1 2 3 4 5 6 7 8 9 10 

PHOSPHORUS, SPECIFIC CONDUCTANCE, DISSOLVED OXYGEN, 

in milligrams per liter as P in microsiemens per centimeter in milligrams per liter 



Figure 3f. Geochemical profiles from pond-bottom vertical multilevel samplers, including dissolved phosphorus, 
specific conductance, and dissolved oxygen, prior to installation of the geochemical barrier (July 2004), and at 
2 (October 2004), 1 1 (July 2005), and 23 months (August 2006) after installation of the geochemical barrier. 



E2 



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PHOSPHORUS, 
in milligrams per liter as P 



100 150 200 250 

SPECIFIC CONDUCTANCE, 
in microsiemens per centimeter 



Pond 



Pond Bottorri 



August 2006 




July 2005 



300 1 2 3 4 5 6 7 8 9 10 

DISSOLVED OXYGEN, 
in milligrams per liter 



Figure 3g. Geochemical profiles from pond-bottom vertical multilevel samplers, including dissolved phosphorus, 
specific conductance, and dissolved oxygen, prior to installation of the geochemical barrier (July 2004), and at 
2 (October 2004), 11 (July 2005), and 23 months (August 2006) after installation of the geochemical barrier. 



Site FSW 646-P01 



CD 



O 
CO 

Q 

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Q- 



00 

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0.0 0.5 1.0 1.5 2.0 2.5 3.0 50 

PHOSPHORUS, 
in milligrams per liter as P 



July 2005 




Pond Bottom 



Oct2004 



I 



July 2004 



August 2006 



Pond 



Pond Bottom. 




July 2005 



100 150 200 250 300 1 2 3 4 5 6 7 8 9 10 

SPECIFIC CONDUCTANCE, DISSOLVED OXYGEN, 

in microsiemens per centimeter in milligrams per liter 



Figure 3h. Geochemical profiles from pond-bottom vertical multilevel samplers, including dissolved phosphorus, 
specific conductance, and dissolved oxygen, prior to installation of the geochemical barrier (July 2004), and at 
2 (October 2004), 1 1 (July 2005), and 23 months (August 2006) after installation of the geochemical barrier. 



M 




Site FSW 647-P01 



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CO 

Q 

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Q- 



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I— 
Q- 
LU 
Q 




0.5 1.0 1.5 2.0 

PHOSPHORUS, 
in milligrams per liter as P 



Pond Bottom 




July 2004 



August 2006 



Get 2004 



3.0 50 



100 150 200 250 

SPECIFIC CONDUCTANCE, 
in microsiemens per centimeter 



Pond 



Pond Bottom , 




300 1 2 3 4 5 6 7 8 9 10 

DISSOLVED OXYGEN, 
in milligrams per liter 



Figure 3i. Geochemical profiles from pond-bottom vertical multilevel samplers, including dissolved phosphorus, 
specific conductance, and dissolved oxygen, prior to installation of the geochemical barrier (July 2004), and at 
2 (October 2004), 11 (July 2005), and 23 months (August 2006) after installation of the geochemical barrier. 




h# 



M 

W3SS 



Site FSW 648-P01 



CD 



O 
CO 

Q 

O 
Q- 



00 

I— 
Q- 
LU 
Q 




Pond 



Pond Bottom 



0.0 0.5 1.0 1.5 2.0 

PHOSPHORUS, 
in milligrams per liter as P 




July 2004 




2.5 3.0 50 100 150 200 250 

SPECIFIC CONDUCTANCE, 
in microsiemens per centimeter 



300 1 2 3 4 5 6 7 8 9 10 

DISSOLVED OXYGEN, 
in milligrams per liter 



Figure 3j. Geochemical profiles from pond-bottom vertical multilevel samplers, including dissolved phosphorus, 
specific conductance, and dissolved oxygen, prior to installation of the geochemical barrier (July 2004), and at 
2 (October 2004), 11 (July 2005), and 23 months (August 2006) after installation of the geochemical barrier. 



IUSGS 

mama for a changing world 



DC1 (Control Site) DC2 

SPECIFIC CONDUCTANCE, SPECIFIC CONDUCTANCE, 

in microsiemens per centimeter in microsiemens per centimeter 

50 100 150 200 250 300 50 100 150 200 250 300 



0.00 



CD 

.E 0.50 



o 

Q 

-z. 
O 
Q_ 



LU 
00 



Q_ 
LU 
Q 



1.00 



1.50 



2.00 



2.50 



3.00 




0.00 



0.50 



1.00 



PHOSPHATE, 
in milligrams per liter as P 



Reddish Brown Film 
on Bottles 

Gray Film on Bottles 




DC3 

SPECIFIC CONDUCTANCE, 

in microsiemens per centimeter 

50 100 150 200 250 300 



1.50 5 0.00 



0.50 



1.00 



5 1.50 



PHOSPHATE, 
in milligrams per liter as P 




0.00 



Phosphate 

Specific Conductance 



October 2004 
July 2005 
November 2005 
August 2006 



0.50 



1.00 



1.50 



PHOSPHATE, 
in milligrams per liter as P 



mm 

SEEffiBffliS 



Figure 4a. Geochemical profiles from pond-bottom vertical diffusion chambers at 2 months (October 2004), 1 1 months (July 2005), 
15 months (November 2005), and 23 months (August 2006) after installation of the geochemical barrier. 



DC4 DC5 DC6 

SPECIFIC CONDUCTANCE, SPECIFIC CONDUCTANCE, SPECIFIC CONDUCTANCE, 

in microsiemens per centimeter in microsiemens per centimeter in microsiemens per centimeter 

50 100 150 200 250 300 50 100 150 200 250 300 50 100 150 200 250 300 



0.00 



Pond 



Pond Bottom 




3.00 



0.00 0.50 1.00 1.50 

PHOSPHATE, 
in milligrams per liter as P 



Reddish Brown Film 
on Bottles 

Gray Film on Bottles 




0.00 0.50 1.00 .50 

PHOSPHATE, 
in milligrams per liter as P 




0.00 



Phosphate 

Specific Conductance 



October 2004 
July 2005 
November 2005 
August 2006 



.50 



0.50 1.00 

PHOSPHATE, 
in milligrams per liter as P 



IUSGS 



KW:j^:ifijf:HjrjJi.JJ|.|/ii.f.iM 



Figure 4b. Geochemical profiles from pond-bottom vertical diffusion chambers at 2 months (October 2004), 11 months (July 2005), 
15 months (November 2005), and 23 months (August 2006) after installation of the geochemical barrier. 



DC7 
SPECIFIC CONDUCTANCE, 
in microsiemens per centimeter 
50 100 150 200 250 300 



CD 
CD 



O 
00 

Q 

z 
o 

Q_ 



0.00 



0.50 



1.00 



1.50 



O 

uj 2.00 

00 

X 

h- 

g 2.50 



3.00 



— I 1 1 1 1 1 1 1 1 1 1 

gj^n r^^ Poncl 

ff%*^ ^^ Pond Bottom 


? ^t n 


1 \ * 
y ■ 




I H^L r^^ ■ l 

[p d^^ 
: ■ 

- , , , , i , , , , i , , 


i i 

, , , , i , , 





0.00 0.50 1.00 1.50 

PHOSPHATE, 
in milligrams per liter as P 



Reddish Brown Film 
on Bottles 

Gray Film on Bottles 



DC8 
SPECIFIC CONDUCTANCE, 
in microsiemens per centimeter 
50 100 150 200 250 300 




0.00 0.50 1.00 .50 

PHOSPHATE, 
in milligrams per liter as P 



Phosphate 

Specific Conductance 



October 2004 
July 2005 
November 2005 
August 2006 



IUSGS 



Figure 4c. Geochemical profiles from pond-bottom vertical diffusion chambers at 2 months (October 2004), 11 months (July 2005), 
15 months (November 2005), and 23 months (August 2006) after installation of the geochemical barrier. 



300 

275 

~ fc 250 

if 225 

g fe 200 

8 S 175 

ll w 150 
O 2 

LU .9 

100 



75 



1.75 



1.50 



1.25 



lu J 1.00 

< «- 

& g 0.75 

Q_ ^ 

=| 0.50 



0.25 



0.00 



300 



275 r 



-fc250 
| | 225 

\- CD 

O o 

Q c^ 

O ^175 
O g 

O g 

u_ to 150 

O 2 

LU .2 

fX J 125 

100 



200 r 



75 



1.75 



1.50 



o- 1.25 



^i 1.00 
< u 

g I 0.75 

Q_ ^ 

I 0.50 



0.25 



0.00 



South Line (Line 1)- 8/8/2006 

Shallow (0.5 feet Below Pond Bottom) 



* ♦ ^ 




15 20 25 30 

Deep (3 feet Below Pond Bottom) 



40 




10 



LU <D 

o = 

X g. 

6 O w 
Q E 

LU CD 

4 §1 

CO c 
Q ' 



2 



10 



8 z. 

LU CD 

CD = 

6 O £ 
Q E 

4 81 

co c 



8.5 
8.0 
7.5 



7 "° S 



6.5 
6.0 
5.5 
5.0 

8.5 
8.0 
7.5 



7.0 x 

Q. 



6.5 
6.0 
5.5 
5.0 



10 15 20 25 30 35 

DISTANCE FROM MEAN SHORELINE POSITION, in feet 



40 



Figure 5a. Geochemical transects from horizontal multiport samplers along line 1 (south) sampled 23 months 
(August 2006) after barrier installation. 





i 


M 


SB 





300 r 



275 
. fe250 r 
I 1 225 

o 8 

g 55 200 

O ^175 
o ® 

LJ- 55 150 



LU 2 

fe E125 

100 - 



75 



1.75 



1.50 



Q- 1.25 



North Line (Line 2)- 8/8/2006 

Shallow (0.5 feet Below Pond Bottom) 



.£11.00 
< 05 

£ °- 

§ E 0.75 

Q_ .2> 



1 0.50 r 



300 



275 



- fc 250 



O o 



=S 225 



CO 



O - 

O CD 



LL "co 

o 2 

LU 2 

0- E 



200 
175 



150 



125 



100 



75 



0.25 



0.00 



1.75 

































— 





























































^ 


4 .♦*♦■■ 


""t^ 


^♦V 


- > ... 


PH 
•■♦.. 


*'>*'* 


.. ••♦••• 


""•♦■■• 


"\ 




>.. 








^- 


^ Phosphate 






SpcN 












f v ' 




*> 


*> 


- 


1 


D.O. V* *"* 

D D D 


— H— 


^B- 


— F^ 


H=F— 


— H^ 



















10 



15 



20 



25 



30 



35 



40 



Deep (3 feet Below Pond Bottom) 



10 15 20 25 30 35 

DISTANCE FROM MEAN SHORELINE POSITION, in feet 



10 



8 







6 O £ 
Q E 

LU CD 
^|> 

4 gl 

& .E 



8.5 
8.0 
7.5 
7.0 x 

Q. 

6.5 
6.0 
5.5 
5.0 








8.5 




10 












8.0 




8 


zf ._ 








LU CD 


7 5 






o = 








S_ s- 






6 


O CO 


70 


X 




Q E 




Q. 




LU CD 








!3 O) 








o = 


6.5 




4 


ISS 

n m 








Q 


6.0 




2 












5.5 









5.0 





Figure 5b. Geochemical transects from horizontal multiport samplers along line 2 (north) sampled 23 months 
(August 2006) after barrier installation. 






South Line (Line 1)-AII Dates 

Shallow (0.5 Feet Below Pond Bottom) 




300 



- 275 



250 


- CD 

O g 


225 


I— CD 




O o 


200 


LJ Q_ 




2 f0 




O c 


175 


O g 




U_ CO 


150 


n 2 




LU O 




Q- E 


125 


W c 



- 100 



75 



2.00 



1.75 



1.50 



h= 1.25 
O | 



03 



1.00 r 



Q_ ^ 



| 0.75 



0.50 : 



0.25 
0.00 



Deep (3 Feet Below Pond Bottom) 



10 15 20 25 30 35 

DISTANCE FROM MEAN SHORELINE POSITION, in feet 



40 



Phosphate 

Specific Conductance 



October 2004 
July 2005 
August 2006 



300 





jSSEfflBHS 



Figure 6a. Geochemical transects from horizontal multilevel samplers along line 1 (south) sampled 2 months (October 2004), 
11 months (July 2005), and 23 months (August 2006) after installation of the geochemical barrier. 



North Line (Line 2)- All Dates 

Shallow (0.5 Feet Below Pond Bottom) 




300 



- 275 



250 


- CD 

O E 

2 ■£ 


225 


I— CD 




O o 


200 


LJ Q_ 




2 f0 




O c 


175 


O g 




LL CO 


150 


n 2 




LU O 




Q- E 


125 


W c 



- 100 



75 



2.00 



Deep (3 Feet Below Pond Bottom) 



10 15 20 25 30 35 

DISTANCE FROM MEAN SHORELINE POSITION, in feet 



300 




Phosphate 

Specific Conductance 



October 2004 
July 2005 
August 2006 




[ft 



HBI 



liTTT 



Figure 6b. Geochemical transects from horizontal multilevel samplers along line 2 (north) sampled 2 months (October 2004), 
11 months (July 2005), and 23 months (August 2006) after installation of the geochemical barrier. 



Geochemical Barrier 

F635 F636 




PHOSPHORUS, in milligrams per liter 



-300 -250 -200 -150 -100 -50 50 100 

DISTANCE FROM ASHUMET POND SHORELINE, IN FEET 

VERTICAL EXTENT OF PHOSPHORUS IN POND- 
BOTTOM GROUND WATER (2006)-Concentrations 
in milligrams per liter as P. interval varies. 



150 



200 



C 



c 



] >i.o 

I 0.5 - 1.0 
H 0.1-0.5 






Figure 7a. Vertical section of phosphorus concentrations in piezometer clusters approximately 23 months (August 2006) after 
installation of the geochemical barrier. 




-300 -250 -200 -150 -100 -50 50 100 

DISTANCE FROM ASHUMET POND SHORELINE, IN FEET 

VERTICAL EXTENT OF NITRATE IN POND- 
BOTTOM GROUND WATER (2006)-Concentrations 
in milligrams per liter as N. Interval varies. 

I I >2.0 



150 



200 



] 1.0-2.0 
I 0.5-1.0 
H 0.1-0.5 



M 




Figure 7b. Vertical section of nitrate concentrations in piezometer clusters approximately 23 months (August 2006) after 
installation of the geochemical barrier. 



Geochemical Barrier 
F635 




AMMONIUM, in milligrams per liter as N 



-300 



-250 



-200 -150 -100 -50 50 100 

DISTANCE FROM ASHUMET POND SHORELINE, IN FEET 

VERTICAL EXTENT OF AMMONIUM IN POND- 
BOTTOM GROUND WATER (2006) - Concentrations 
in milligrams per liter as N. Interval varies. 



150 



200 



] >i.o 

I 0.5-1.0 
3 0.1-0.5 



IUSGS 

science for a changing woM 



Figure 7c. Vertical section of ammonium concentrations in piezometer clusters approximately 23 months (August 2006) after 
installation of the geochemical barrier. 



Meter 1a 
(South) 



Meter 1b 
(North) 





250 




225 


^1- 


200 


CD 




CD 
CM 


175 


CH 


150 


III 




DO 


125 


O 

1— 


100 


o 
o 


75 




50 




>N 




-g 25 




!_ 




2.250 








S 225 




+-> 




- 200 




175 


CD 


150 


_l 


§ 125 

^ 100 


j 


QC 




P 75 




< 




5 50 




25 




250 




225 




200 


CO 




CD 


175 


CD 




CsJ 


150 


h- 




CO 


125 


=) 




o 


100 


< 


75 




50 




25 



77.0 

209.4 



47.9 



120.1 



nn 



12 3 12 3 


■ 






176 


■ 


93.9 






209. 


1 — 








11 


11 


21 


11 


21 




■ 


118? 


- 


6 


21 


11 


21 


11 





12 3 4 5 
253.41 253.41 
237.4' ' 



12 3 4 5 



318 



21 11 11 21 21 



12345 12345 



Meter 2a 
(South) 



Meter 2b 
(North) 



Pond level 
too low for 
measurement 


' Pond level 
too low for 
: measurement 































7.1 




: 


: 






107.4 


■ 


, ,102.1 






■ 


11 


15 


10 


15 


10 




■ 


11 


10 


15 


10 


15 







1 


2 


3 


4 


5 






1 


2 


3 


4 


5 




2.9 




1.5 


: 










100.8 


: 








97.0 


: 


1a 


10 


1a 


10 


1a 




■ 


10 


1a 


10 


1a 


10 





Meter 3a 
(South) 


Meter 3b 
(North) 


6.5 : 

96.6 i 

nnr 


38.6 

i 1 179.0 



12 3 4 



12 3 4 









1.7 


: 






4.0 


■ 




: 






98.6 






■ 1 




85.0 


: 


3 


36 




36 


3 


36 


3 


ra 


: rA 


36 


3 







1 


2 


3 


4 


5 




1 


2 


3 


4 


5 




4.9 


7.3 


■ 


95.7 




: 




94.2 








■ 


1a 


8 


1a 


8 




: 


8 


1a 


8 


1a 





12345 12345 1234 

Trial Number 



12 3 4 



Initial measurement after installation of meter's lid 



Average water flux for all trials, excluding initial measurement, in liters per day 



Meter 4a 
(South) 



Meter 4b 
(North) 



1-3 

-nnr 


0.0 



12 3 4 



12 3 4 

















9.6 


■ 








61.6 


■ 


21 


8 


17 


8 


rrn 



■ 




13.2 

61.3 


: I 10 


17 


8 


17 


8 







1 


2 


3 


4 


5 




1.2 


■ 




71.3 






: 


8 


17 


8 


17 





12 3 4 



77.0 Phosphorus flux, in milligrams per day 






12 3 4 5 











2.8 


55.4 






17 


8 


17 


8 





12 3 4 



Figure 8. Field seepage data and phosphorus flux analysis for samples collected 2, 11, and 23 months after barrier installation 
at permanent seepage meters installed near (la-b) and in (2a-b, 3a-b, 4a-b) the geochemical barrier. 



0.5 FEET 



1.5 FEET 



3.0 FEET 



280010 280030 280050 280070 280090 280110 




280010 



280 


010 


280 


030 


280 


050 


280070 


280090 


280110 




















/ 






















/ 
























/ 
























L 






















A f ^ oo / 
ft oL 

y/oD / ° 




















/°Oo 


o / 
0/ 






















^ 


o/ 




















°o 






















%> 


6 / 


' o 


















o 


/ 






Ashumet 
Pond 












°bs 




















O 


































15 30 60 90 


120 


Feet 
















5 





20 


30 


40 Meters 



























280010 



280030 



280050 



280070 



280090 



280110 




280030 



280050 



280070 



280090 



280110 



Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



280010 280030 280050 280070 280090 280110 

o Temporary Drive Point 

A Temporary Push Point - Field Measurements Only 



280010 



280030 



280050 



280070 



280090 



280110 



mm 

33ESS 



Figure 9a. Locations of temporary drive points installed in August 2006 at three depths (0.5, 1 .5, and 3.0 feet) below the pond bottom to monitor ground water 
below and within the geochemical barrier at Ashumet Pond. 



0.5 FEET 



o 


280 


010 


280 


030 


280 


050 


280 


070 


280 


090 


280 


110 


CO 

O _ 


























CM 

00 


























o 
o _ 


























cm 

00 
















▲ 


io 
\ c 


> 
o 






o 

CM 

o _ 


















roo 


f o 






CM 

00 
















rk 


o 1 
°r 

o/ 








o 
o 
o _ 


















/ ° 








CM 

00 
















A 


J o 








o 

00 












^> 


O / 


o 










o 

CM 

00 










^F° 


o / 


^o 
o 






\shun 
Porn 


let 
1 




o 
CO 






<0 






> 
o 














o 

CM 

00 






% 





o 
















o 
















15 3 


6( 


) 90 


120 


Feet 


o 

CM 




















ers 




00 


3 6 12 18 24Me 





























1.5 FEET 

280010 280030 280050 280070 280090 280110 



3.0 FEET 



280010 



280030 



280050 



280070 



280090 



280110 











































































































































D / O 




















^r ° 


o / 
0/ 






















C 


0/ 






















/ 


















/jf^°° 


O J 




















^0 


/ 






fishumet 
Pono 












<b 




















o 


































15 30 60 90 


120 


Feet 
















Bnn^ff^i 




ters 




3 6 12 16 


24 Me 



























280010 



280030 



280050 



280070 



280090 



280110 



Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



FIELD PHOSPHATE, 
milligrams per liter as P 

1.70 



o Temporary Drive Point 

^ Temporary Push Point - Field Measurements Only 






280010 


280030 


280050 


280070 


280090 


280110 






















/ 






co 


























o 

CM 

00 


























o 
























o 

T- 

CM 

00 


















roo ^7 






o 

CM 


















o J 








o 

CM 

00 
















/ ° 








o 
o 












ym n ° °o. 


>o 








o 

T- 

CM 

00 










&.'- 


O 










o 

00 








A 


>/° 


W> 


\ 




Ashumot 
Pnnd 




o 

CM 

00 


^^ 


-^ 


% 


mx 














o 
CO 






% 





O 
















o 

CM 

00 
















15 30 60 90 


120 


Feet 


o 




















ters 




o 


3 6 12 18 24 Me 


CM 

00 





























280010 



280030 



280050 



280070 



280090 



280110 



0.9 



0.1 



<0.1 



IUSGS 



nMifiriiittiiriif'iii'iiiiiii 



Figure 9f. Map showing distribution of field phosphate in August 2006 in pond-bottom ground water at three depths below and within the geochemical barrier 
at Ashumet Pond. The maps are generated from hand-contours using a geographic information system (GIS). 



0.5 FEET 



1.5 FEET 



3.0 FEET 



280010 280030 280050 280070 280090 280110 




280010 



280 


010 


280 


030 


280 


050 


280070 


280090 


280110 




















/ 






















/ 
























/ 
























L 






















A f ^ oo / 
ft oL 

y/oD / ° 




















/°Oo 


o / 
0/ 






















^ 


o/ 




















°o 






















%> 


6 / 


' o 


















o 


/ 






Ashumet 
Pond 












°bs 




















O 


































15 30 60 90 


120 


Feet 
















5 





20 


30 


40 Meters 



























280010 



280030 



280050 



280070 



280090 



280110 




280030 



280050 



280070 



280090 



280110 



Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



280010 280030 280050 280070 280090 280110 

o Temporary Drive Point 

A Temporary Push Point - Field Measurements Only 



280010 



280030 



280050 



280070 



280090 



280110 



mm 

33ESS 



Figure 9a. Locations of temporary drive points installed in August 2006 at three depths (0.5, 1 .5, and 3.0 feet) below the pond bottom to monitor ground water 
below and within the geochemical barrier at Ashumet Pond. 



0.5 FEET 



1.5 FEET 



3.0 FEET 



280010 280030 280050 280070 280090 280110 




280010 



280 


010 


280 


030 


280 


050 


280070 


280090 


280110 




















/ 






















/ 
























/ 
























L 






















A f ^ oo / 
ft oL 

y/oD / ° 




















/°Oo 


o / 
0/ 






















^ 


o/ 




















°o 






















%> 


6 / 


' o 


















o 


/ 






Ashumet 
Pond 












°bs 




















O 


































15 30 60 90 


120 


Feet 
















5 





20 


30 


40 Meters 



























280010 



280030 



280050 



280070 



280090 



280110 




280030 



280050 



280070 



280090 



280110 



Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



280010 280030 280050 280070 280090 280110 

o Temporary Drive Point 

A Temporary Push Point - Field Measurements Only 



280010 



280030 



280050 



280070 



280090 



280110 



mm 

33ESS 



Figure 9a. Locations of temporary drive points installed in August 2006 at three depths (0.5, 1 .5, and 3.0 feet) below the pond bottom to monitor ground water 
below and within the geochemical barrier at Ashumet Pond. 



0.5 FEET 



1.5 FEET 





28001 





28003 







28005 





28007 





28009 





28011 





o _ 




















/ 






o 

T- 

CM 

00 


























o _ 


























o 

CM 

00 
















▲ 


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7m 


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00 












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▲ 


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15 3 


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120 


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ters 




o 

CM 

00 


3 6 12 18 24 Me 































28001 





28003 





280050 


280070 


280090 


280110 


































































































































JA 




°/ 




















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O / 






















o/ 






















/ o 




















o/ 








Ashumet 
Pond 




























^ 






































15 30 60 90 


120 


Feet 




















ers 




3 6 12 1£ 


24 Me 



























280010 



280030 



280050 



280070 



280090 



280110 



280010 



280030 



280050 



280070 



280090 



280110 



Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



o Temporary Drive Point 

^ Temporary Push Point - Field Measurements Only 



SPECIFIC CONDUCTANCE, 
in microsiemens per centimeter 

300 



175 



3.0 FEET 

280010 280030 280050 280070 280090 280110 




280010 



280030 



280050 



280070 



280090 



280110 



riiiifiiiiiiiiifid'Hi'iiiiiri 



50 



Figure 9b. Map showing distribution of specific conductance in August 2006 in pond-bottom ground water at three depths below and within the geochemical barrier 
at Ashumet Pond. The maps are generated from hand-contours using a geographic information system (GIS). 



0.5 FEET 



1.5 FEET 



3.0 FEET 



o 


280 


310 


280 


330 


280 


350 


280 


370 


280090 


280 


110 


o _ 
























00 


























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CM 

00 


























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CM 

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CM 

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15 3 


6( 


) 90 


120 


Feet 


o 

CM 




















ters 




00 


3 6 12 n 


24 Me 





























280010 280030 280050 280070 

Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



280090 



280110 



280 


310 


280 


330 


280 


350 


280070 


280090 
1 


280110 


















/ 






















/ 
























h 


** 


^ 




















L 






f 


















= • 






















ol 
























/ 






















/ 

0/ 






















8 . 


/ o 


















S° 


o / 
0/ 








s\shumet 
Pond 












% 
















^ 




O 


































15 30 60 90 


120 


Feet 




















ters 




3 6 12 1£ 


24 Me 



























280010 



280030 



280050 



280070 



280090 



280110 



280010 280030 280050 280070 280090 



DISSOLVED OXYGEN, 
in milligrams per liter 



280110 



o Temporary Drive Point 



" 



10 



<0.1 




280010 



280030 



280050 



280070 



280090 



280110 



IUSGS 

sciatica for a changing world 



0.1 



Figure 9c. Map showing distribution of dissolved oxygen in August 2006 in pond-bottom ground water at three depths below and within the geochemical barrier 
at Ashumet Pond. The maps are generated from hand-contours using a geographic information system (GIS). 



0.5 FEET 

280010 280030 280050 280070 280090 280110 



o 


























o_ 


















/ 






CM 
00 


















/ 








o 


















/ 








CM 
00 


















k, 






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CM 
















W Ik 






CM 
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CM 
00 












V 4 


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o 

CM 
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Ashut 
Pon 


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d 




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o 

CM 
00 






% 





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o 
<<* 
















15 3 


6( 


) 90 


120 


Feet 


CM 
















■"■■ — 




ers 




00 


3 6 12 1E 


24 Me 





























280010 



280030 



280050 280070 



Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



280090 



280110 



1.5 FEET 

280010 280030 280050 280070 280090 280110 









































































































































fm 1°/ 
yWbdmm t ° 


















f 


r Jm\ °/ 








































/ A\ 






















/ ° A 


f o 


















o <y 






Ashumet 
Pond 










K ^ 


















o 


































15 30 60 90 


120 


Feet 
























3 6 12 18 24 Me 


ters 



























280010 280030 280050 280070 



280090 



280110 



PH. 
standard units 



o Temporary Drive Point 



■ 



8.5 



5.0 



3.0 FEET 

280010 280030 280050 280070 280090 280110 



























o 




















/ 






(£> 


















/ 








CM 

00 


















/ 








o 
<<* 


















R° 






CM 

00 


















% 






o 

CM 
















/X oc 








CM 

00 


















/° 








o 
o 
















>o 








CM 

00 












Jm\ ° / 


f o 






















^O / 


o 










o 

00 










2LA> 


Ashumet 
Pond 




o 

CM 

00 






<& 


o\ 


<hy 


o 














o 
to 






<*> 





o 
















o 

CM 

00 
















15 30 60 90 


120 


Feet 


o 
<<* 


















ters 




o 


3 6 12 18 24 Me 


00 





























280010 



280030 



280050 280070 



280090 



280110 



22EE53E! 



Figure 9d. Map showing distribution of pH in August 2006 in pond-bottom ground water at three depths below and within the geochemical barrier at Ashumet Pond. 
The maps are generated from hand-contours using a geographic information system (GIS). 



0.5 FEET 



1.5 FEET 



3.0 FEET 



o 


280 


010 


280 


030 


280 


050 


280 


070 


280090 


280 


110 


(O 




















/ 






CM 

00 


















/ 








o 
<* 


















/ 








CM 

00 
















▲ 


f^ 






o 

CM 
















Jk 




>/ 






CM 

00 
























o 
o 
















t % 








CM 

00 














4a/ %J o 








o 

00 






















o 

CM 

00 








Sa 


AA 






\shun 
Pon 


net 
1 




o 








Kx: 














o 

CM 

00 


^ 


m 







o 






















o 
















15 3 


6( 


) 90 


120 


Feet 


o 
















m m ' i j 




ters 




00 


3 6 12 1£ 


24 Me 





























280010 280030 280050 280070 280090 280110 



280010 280030 280050 280070 

Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



280090 



280110 



















! ' 


/ 






















/ 
























/ 
























/ 






















s?os r ° 




















A 


9 / 
0/ 

7 






















y 


V 




















'On 


0/ 




















**o 




K O 




















o s 






Ashumet 
Pond 












A 




















































15 30 60 90 


120 


Feet 
















" " 




■ 




I - - — ^ 


ers 






3 6 12 18 24 Me 



280010 



280030 



280050 



280070 



280090 



280110 



o Temporary Drive Point 

^ Temporary Push Point - Field Measurements Only 



TEMPERATURE, 
°C 

28 



21 



280010 


280030 


280050 


280070 


280090 


280110 


o 




















/ 






(O 


















/ 








CM 

00 


















/ 








o 


















fc> 






CM 

00 


















r ooj 
° p 






o 

CM 
















A 


O i 








CM 

00 
















^ 


o / 
/ ° 








o 
o 
















o^ 


>o 








CM 

00 












K> 


> 


r O 

o 










o 

00 










y° 


o y 


o 




Ashumet 
Pond 




o 

CM 

00 






-^ 


o\ 
















o 


^ 




V 


o 
















o 

CM 

00 
















15 30 60 90 


120 


Feet 


o 




























ers 




3 6 I 12 18| 24 Me 


00 
















I 













280010 



280030 



280050 



280070 



280090 



280110 




m 



SSSBEHS! 



13 



Figure 9e. Map showing distribution of temperature in August 2006 in pond-bottom ground water at three depths below and within the geochemical barrier 
at Ashumet Pond. The maps are generated from hand-contours using a geographic information system (GIS). 



0.5 FEET 



o 


280 


010 


280 


030 


280 


050 


280 


070 


280 


090 


280 


110 


CO 

O _ 


























CM 

00 


























o 
o _ 


























cm 

00 
















▲ 


io 
\ c 


> 
o 






o 

CM 

o _ 


















roo 


f o 






CM 

00 
















rk 


o 1 
°r 

o/ 








o 
o 
o _ 


















/ ° 








CM 

00 
















A 


J o 








o 

00 












^> 


O / 


o 










o 

CM 

00 










^F° 


o / 


^o 
o 






\shun 
Porn 


let 
1 




o 
CO 






<0 






> 
o 














o 

CM 

00 






% 





o 
















o 
















15 3 


6( 


) 90 


120 


Feet 


o 

CM 




















ers 




00 


3 6 12 18 24Me 





























1.5 FEET 

280010 280030 280050 280070 280090 280110 



3.0 FEET 



280010 



280030 



280050 



280070 



280090 



280110 











































































































































D / O 




















^r ° 


o / 
0/ 






















C 


0/ 






















/ 


















/jf^°° 


O J 




















^0 


/ 






fishumet 
Pono 












<b 




















o 


































15 30 60 90 


120 


Feet 
















Bnn^ff^i 




ters 




3 6 12 16 


24 Me 



























280010 



280030 



280050 



280070 



280090 



280110 



Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



FIELD PHOSPHATE, 
milligrams per liter as P 

1.70 



o Temporary Drive Point 

^ Temporary Push Point - Field Measurements Only 






280010 


280030 


280050 


280070 


280090 


280110 






















/ 






co 


























o 

CM 

00 


























o 
























o 

T- 

CM 

00 


















roo ^7 






o 

CM 


















o J 








o 

CM 

00 
















/ ° 








o 
o 












ym n ° °o. 


>o 








o 

T- 

CM 

00 










&.'- 


O 










o 

00 








A 


>/° 


W> 


\ 




Ashumot 
Pnnd 




o 

CM 

00 


^^ 


-^ 


% 


mx 














o 
CO 






% 





O 
















o 

CM 

00 
















15 30 60 90 


120 


Feet 


o 




















ters 




o 


3 6 12 18 24 Me 


CM 

00 





























280010 



280030 



280050 



280070 



280090 



280110 



0.9 



0.1 



<0.1 



IUSGS 



nMifiriiittiiriif'iii'iiiiiii 



Figure 9f. Map showing distribution of field phosphate in August 2006 in pond-bottom ground water at three depths below and within the geochemical barrier 
at Ashumet Pond. The maps are generated from hand-contours using a geographic information system (GIS). 



0.5 FEET 



1.5 FEET 



3.0 FEET 



o 


280 


)10 


280 


330 


280 


050 


280 


070 


280 


090 


280 


110 


o 


























CM 

CO 


























o 
<* 

o 


























CM 

CO 


















I c 


> 
o 






o 

CM 
















Sgo 


roo 

< 


f ° 






CM 

CO 
















r° n 


o 1 








o 
o 
















% 


oji 
/ ° 








CM 

CO 
















°/0 


>o 








o 

CO 
Oi 












™>0 


OS 


' 

o 










CM 

CO 












o y 


o 
o 




/ 


\shun 
Pone 


let 

1 




o 

CO 

0>_ 






9j 




°0, 


> 

Q 














o ■ 

CM 

CO 






% 





o 
















o 

Oi _ 
















15 3 


6( 


) 90 


120 


Feet 


CM 
















SnnH=i 




ters 




CO 


3 6 12 18J 24 Me 





























280010 



280030 



280050 280070 



280090 



280110 



Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



o Temporary Drive Point 



280 


010 


280 


030 


280050 


280070 


280090 


280110 




















/ 






















/ 
























/ 
























L 
























r»„y 

/ ° 




















W— ° 


o 

0/ 






















V 


/ 




















W°o 

'Oq 


V* 






















j 


/ o 


















S° 


< 

/ 

0/ 


y 




Ashumet 
Pond 












°o 
















^ 




O 


































15 30 60 90 


120 


Feet 




















ters 




3 6 12 id 24 Me 



























280010 



280030 



280050 



280070 



280090 



280110 



DISSOLVED PHOSPHORUS, 
in milligrams per liter as P 
,1.70 



■ 



0.9 



<0.1 



280010 


280030 


280050 


280070 


280090 


280110 


o 




















/ 






_o 


















/ 








CM 

CO 


















/ 








o 


















L^ 






CM 

CO 


















i"'2 






o 

CM 


















op 








CM 

CO 
















/ 

/ ° 








o 
o 














x7 


} o 








CM 

CO 














O / 


f o 

o 










o 

CO 

— O) 














^O 

o 






Ashumet 
Pord 




o 

CM 

CO 






<o 


















o 

CO 
— CJ> 


^ 




<0 





o 
















o 

CM 

CO 
















15 30 60 90 


120 


Feet 


o 
























o 




ters 


CM 


3 6 I 12 id 24 Me 


CO 





























280010 



280030 



280050 



280070 



280090 



280110 



IUSGS 



nmmiiWmmmi'i 



0.1 



Figure 9g. Map showing distribution of dissolved phosphorus in August 2006 in pond-bottom ground water at three depths below and within the geochemical barrier 
at Ashumet Pond. The maps are generated from hand-contours using a geographic information system (GIS). 



0.5 FEET 



1.5 FEET 



3.0 FEET 



280010 



280030 280050 



280070 280090 



280110 




280010 280030 280050 280070 

Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



280090 



280110 



280 


010 


280 


030 


280 


050 


280070 


280090 


280110 


















































































































roo / 
% 

D / O 






















0/ 






















°°o, 


Of 




















On 


o 


















^b 


6 j 


























o y 








Ashijmet 
Pond 












<b, 




















o 


































15 30 60 90 


120 


Feet 
















KSS^ 




ers 




3 6 12 16 


24 Me 



























280010 280030 280050 280070 



280090 



280110 



280010 280030 280050 280070 



280090 



280110 



o Temporary Drive Point 



DISSOLVED NITRATE, 
in milligrams per liter as N 



1.20 




280010 280030 280050 280070 



280090 280110 



H 



3£ 




<0.1 



0.1 



Figure 9h. Map showing distribution of dissolved nitrate in August 2006 in pond-bottom ground water at three depths below and within the geochemical barrier 
at Ashumet Pond. The maps are generated from hand-contours using a geographic information system (GIS). 



0.5 FEET 



1.5 FEET 



3.0 FEET 



280010 280030 



280050 280070 280090 280110 

















































/ 
























/ 


























/ 


























^ 


o 






















f/° 


roo 
< 

D 


> / 

r ° 
























oj6 
























( R 


0/ 
/ ° 
























y 

/ 


> o 

1 




















Xo 


> 


;• 


1 




















o y 


\ 




> 


\S/?1/A7 

Pone 


let 
1 










9, 


o\ 




o 




















% 





o 
































15 3 


6( 


) 90 


120 


Feet 


















InS 




ers 






3 6 12 1£ 


24 Me 





























280010 280030 



280050 



280070 280090 



280110 



Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHill in October 2006. 
State plane coordinates in NAD83 (meters) 



280 


)10 


280 


330 


280 


)50 


280070 


280090 


280110 




















/ 




























































































/jr °°o/ 

X 9oo / ° 




















/°° n 


o / 
0/ 






















by 


0/ 






















0/ 




















K> 


O / 


r 9 




















o / 






/shurret 
Pond 












<fc, 
















^ 




O 


































15 30 60 90 


120 


Feet 
















m m ^ m ^ m - 




ers 




3 6 12 1£ 


24 Me 



























280010 



280030 280050 



280070 280090 



280110 



280010 280030 280050 280070 



280090 



280110 



DISSOLVED AMMONIUM, 
in milligrams per liter as N 



o Temporary Drive Point 






2.25 



1.20 



0.1 



<0.1 

























































































J c 


o 






















/»; 


> / 






















o 1 






















/ " 


/ ° 




















'On 


7 

/ 


>o 


















^% 


o > 


f 




















o y 


y °o 


f 


Ashumst 
Pond 








9, 


o\ 




o 














^ 




/' 


o 


















1 


V 










15 30 6( 


) 90 


120 Feet 
















3 6 12 ii 


24 Me:ers 





280010 



280030 280050 280070 280090 



280110 




^ 



asss 



Figure 9i. Map showing distribution of dissolved ammonium in August 2006 in pond-bottom ground water at three depths below and within the geochemical barrier 
at Ashumet Pond. The maps are generated from hand-contours using a geographic information system (GIS). 



0.5 FEET 



1.5 FEET 





28001 





28003 







28005 





28007 





28009 





28011 





o _ 




















/ 






o 

T- 

CM 

00 


























o _ 


























o 

CM 

00 
















▲ 


Jo 

fA C 


> 
o 






o _ 
















7m 


/ ° 






CM 

o 

CM 

00 


















' 0j6 








o _ 
















oZ 
/ ° 








o 
o 

T- 

CM 

00 












▲ 


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> o 








o _ 














O / 


o 










00 

o> 

o 

CM 

00 








▲ 


° 




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O 






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Po 






o _ 












> 

o 














O) 

o 

CM 

00 


^ 









o 
















o _ 
















15 3 


6( 


) 90 


120 


Feet 






















ters 




o 

CM 

00 


3 6 12 18 24 Me 































28001 





28003 





280050 


280070 


280090 


280110 


































































































































JA 




°/ 




















<J °° 0/ 


O / 






















o/ 






















/ o 




















o/ 








Ashumet 
Pond 




























^ 






































15 30 60 90 


120 


Feet 




















ers 




3 6 12 1£ 


24 Me 



























280010 



280030 



280050 



280070 



280090 



280110 



280010 



280030 



280050 



280070 



280090 



280110 



Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



o Temporary Drive Point 

^ Temporary Push Point - Field Measurements Only 



SPECIFIC CONDUCTANCE, 
in microsiemens per centimeter 

300 



175 



3.0 FEET 

280010 280030 280050 280070 280090 280110 




280010 



280030 



280050 



280070 



280090 



280110 



riiiifiiiiiiiiifid'Hi'iiiiiri 



50 



Figure 9b. Map showing distribution of specific conductance in August 2006 in pond-bottom ground water at three depths below and within the geochemical barrier 
at Ashumet Pond. The maps are generated from hand-contours using a geographic information system (GIS). 



0.5 FEET 



1.5 FEET 



3.0 FEET 



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280 


310 


280 


330 


280 


350 


280 


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Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



280090 



280110 



280 


310 


280 


330 


280 


350 


280070 


280090 
1 


280110 


















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280110 



280010 280030 280050 280070 280090 



DISSOLVED OXYGEN, 
in milligrams per liter 



280110 



o Temporary Drive Point 



" 



10 



<0.1 




280010 



280030 



280050 



280070 



280090 



280110 



IUSGS 

sciatica for a changing world 



0.1 



Figure 9c. Map showing distribution of dissolved oxygen in August 2006 in pond-bottom ground water at three depths below and within the geochemical barrier 
at Ashumet Pond. The maps are generated from hand-contours using a geographic information system (GIS). 



0.5 FEET 

280010 280030 280050 280070 280090 280110 



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Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



280090 



280110 



1.5 FEET 

280010 280030 280050 280070 280090 280110 









































































































































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standard units 



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280010 



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280050 280070 



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22EE53E! 



Figure 9d. Map showing distribution of pH in August 2006 in pond-bottom ground water at three depths below and within the geochemical barrier at Ashumet Pond. 
The maps are generated from hand-contours using a geographic information system (GIS). 



0.5 FEET 



1.5 FEET 



3.0 FEET 



o 


280 


010 


280 


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280 


050 


280 


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280010 280030 280050 280070 280090 280110 



280010 280030 280050 280070 

Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



280090 



280110 



















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3 6 12 18 24 Me 



280010 



280030 



280050 



280070 



280090 



280110 



o Temporary Drive Point 

^ Temporary Push Point - Field Measurements Only 



TEMPERATURE, 
°C 

28 



21 



280010 


280030 


280050 


280070 


280090 


280110 


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Ashumet 
Pond 




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CM 

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CM 

00 
















15 30 60 90 


120 


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3 6 I 12 18| 24 Me 


00 
















I 













280010 



280030 



280050 



280070 



280090 



280110 




m 



SSSBEHS! 



13 



Figure 9e. Map showing distribution of temperature in August 2006 in pond-bottom ground water at three depths below and within the geochemical barrier 
at Ashumet Pond. The maps are generated from hand-contours using a geographic information system (GIS). 



0.5 FEET 



o 


280 


010 


280 


030 


280 


050 


280 


070 


280 


090 


280 


110 


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1.5 FEET 

280010 280030 280050 280070 280090 280110 



3.0 FEET 



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280050 



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280090 



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3 6 12 16 


24 Me 



























280010 



280030 



280050 



280070 



280090 



280110 



Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



FIELD PHOSPHATE, 
milligrams per liter as P 

1.70 



o Temporary Drive Point 

^ Temporary Push Point - Field Measurements Only 






280010 


280030 


280050 


280070 


280090 


280110 






















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280050 



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280110 



0.9 



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nMifiriiittiiriif'iii'iiiiiii 



Figure 9f. Map showing distribution of field phosphate in August 2006 in pond-bottom ground water at three depths below and within the geochemical barrier 
at Ashumet Pond. The maps are generated from hand-contours using a geographic information system (GIS). 



0.5 FEET 



1.5 FEET 



3.0 FEET 



o 


280 


)10 


280 


330 


280 


050 


280 


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280 


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3 6 12 18J 24 Me 





























280010 



280030 



280050 280070 



280090 



280110 



Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



o Temporary Drive Point 



280 


010 


280 


030 


280050 


280070 


280090 


280110 




















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280010 



280030 



280050 



280070 



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280110 



DISSOLVED PHOSPHORUS, 
in milligrams per liter as P 
,1.70 



■ 



0.9 



<0.1 



280010 


280030 


280050 


280070 


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280050 



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nmmiiWmmmi'i 



0.1 



Figure 9g. Map showing distribution of dissolved phosphorus in August 2006 in pond-bottom ground water at three depths below and within the geochemical barrier 
at Ashumet Pond. The maps are generated from hand-contours using a geographic information system (GIS). 



0.5 FEET 



1.5 FEET 



3.0 FEET 



280010 



280030 280050 



280070 280090 



280110 




280010 280030 280050 280070 

Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



280090 



280110 



280 


010 


280 


030 


280 


050 


280070 


280090 


280110 


















































































































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280090 



280110 



280010 280030 280050 280070 



280090 



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o Temporary Drive Point 



DISSOLVED NITRATE, 
in milligrams per liter as N 



1.20 




280010 280030 280050 280070 



280090 280110 



H 



3£ 




<0.1 



0.1 



Figure 9h. Map showing distribution of dissolved nitrate in August 2006 in pond-bottom ground water at three depths below and within the geochemical barrier 
at Ashumet Pond. The maps are generated from hand-contours using a geographic information system (GIS). 



0.5 FEET 



1.5 FEET 



3.0 FEET 



280010 280030 



280050 280070 280090 280110 

















































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15 3 


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3 6 12 1£ 


24 Me 





























280010 280030 



280050 



280070 280090 



280110 



Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHill in October 2006. 
State plane coordinates in NAD83 (meters) 



280 


)10 


280 


330 


280 


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280070 


280090 


280110 




















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280030 280050 



280070 280090 



280110 



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280090 



280110 



DISSOLVED AMMONIUM, 
in milligrams per liter as N 



o Temporary Drive Point 






2.25 



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0.1 



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280010 



280030 280050 280070 280090 



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^ 



asss 



Figure 9i. Map showing distribution of dissolved ammonium in August 2006 in pond-bottom ground water at three depths below and within the geochemical barrier 
at Ashumet Pond. The maps are generated from hand-contours using a geographic information system (GIS). 



0.5 FEET 



1.5 FEET 



3.0 FEET 



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280010 



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280110 



Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. 
Extent of the geochemical barrier determined using GPS by CH2MHNI in October 2006. 
State plane coordinates in NAD83 (meters) 



o Temporary Drive Point 



280 


010 


280 


030 


280050 


280070 


280090 


280110 




















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ters 




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280010 



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280050 



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280090 



280110 



DISSOLVED PHOSPHORUS, 
in milligrams per liter as P 
,1.70 



■ 



0.9 



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280050 


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280090 


280110 


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<o 


















o 

CO 
— CJ> 


^ 




<0 





o 
















o 

CM 

CO 
















15 30 60 90 


120 


Feet 


o 
























o 




ters 


CM 


3 6 I 12 id 24 Me 


CO 





























280010 



280030 



280050 



280070 



280090 



280110 



IUSGS 



nmmiiWmmmi'i 



0.1 



Figure 9g. Map showing distribution of dissolved phosphorus in August 2006 in pond-bottom ground water at three depths below and within the geochemical barrier 
at Ashumet Pond. The maps are generated from hand-contours using a geographic information system (GIS). 



U.S. Geological Survey 



Ashumet Pond Geochemical Barrier - August 2006 



Table 1. Field and laboratory chemical analysis of samples from vertical pond-bottom multilevel samplers collected prior to installation, and two, eight, 1 1 and 23 months after barrier installation. 



[Location of sites shown in figure 2. F shorthand for MA-FSW. F645P01 could not t 
determined and nitrogen samples were collected at three of the 10 profiles. Phosphor 
August 2006 were reported in letters dated 12/13/04, 7/21/05, and 9/26/05.] 



installed during iron-ba 

< and nitrogen samples \ 



r emplacement because ol coffer dam. This sampler was temporarily driven during the sampling round. Length of sampling interval is 0.04 ft. Elevatio 
; analyzed at the USGS National Water Quality Laboratory. State plane coordinates are from North Atlantic Datum 1983 (NAD$B?/cn 



■; of all permanently installed devices were determined. >,m October 6. 2004 by the U.S. Geological Survey, pi I \ allies 
t 25oC; <, actual value less than method detection limit: H. estimated value; — , no data. Results prior tc 





Date Sampled 


Specific Conductance IjaS/cm) 


Dissolved Oxygen (mg/L) 




Easting 


Northing 


Depth Below 


































NAD83 


NAD83 


Pond Bottom 


Altitude of 


Pre 


Postl 


Post 2 


Post 3 


Post5 


Pre 


Postl 


Post 2 


Post 3 


Post5 


Pre 


Post 1 Post 2 Post 3 


Post5 


USGS Site Name 


(meters) 


(meters) 


(feet) 


Port (feet) 


July 2004 


October 2004 


April 2005 


July 2005 


August 2006 


July 2004 


October 2004 


April 2005 


July 2005 


August 2006 


July 2004 


October 2004 April 2005 July 2005 


August 2006 


F639P01-0000 


280035.999 


820958.504 


0.02 


42.84 


7/20/2004 


1 0/29/2004 




7/18/05 


8/1/2006 


98.5 


101 




99.0 


99.1 


0.700 


10.2 


2.31 


7.85 


F639P01 -0000.8 


280035.999 


820958.504 


0.82 


42.04 


7/20/2004 


1 0/29/2004 




7/18/05 


8/1/2006 


153 


233 




179 


106 




1.32 


0.215 


0.225 


F639P01-0001.6 


280035.999 


820958.504 


1.62 


41.24 


7/20/2004 


1 0/29/2004 




7/18/05 


8/1/2006 


138 


227 




180 


102.9 




2.44 


0.145 


1.62 


F639P01 -0002.2 


280035.999 


820958.504 


2.22 


40.64 


7/20/2004 


1 0/29/2004 




7/18/05 


8/1/2006 


120 


221 




181 


104.8 


2.10 


2.86 


0.200 


1.66 


F639P01 -0003.4 


280035.999 


820958.504 


3.42 


39.44 


7/20/2004 


1 0/29/2004 




7/18/05 


8/1/2006 


94.6 


216 




178 


118.1 


8.30 


6.83 


0.435 


1.44 


F640P0 1-0000 


280041.672 


820968.084 


0.02 


43.22 


7/21/2004 


1 0/29/2004 


4/20/2005 


7/19/05 


8/1/2006 


97.6 


107 


199 


192 


173.2 


8.40 


2.82 


2.11 


0.390 


F640P01 -0000.8 


280041.672 


820968.084 


0.82 


42.42 


7/21/2004 


1 0/29/2004 


4/20/2005 


7/19/05 


8/1/2006 


153 


119 


197 


210 


184 


0.700 


0.170 0.000 0.060 


3.67 


F640P01-0001.6 


280041.672 


820968.084 


1.62 


41.62 


7/21/2004 


1 0/29/2004 


4/20/2005 


7/19/05 


8/1/2006 


162 


126 


181 


203 


187.9 


0.900 


0.750 0.025 0.000 


0.145 


F640P0 1-0002.2 


280041.672 


820968.084 


2.22 


41.02 


7/21/2004 


1 0/29/2004 


4/20/2005 


7/19/05 


8/1/2006 


160 


128 


157 


192 


183.7 


0.700 


3.77 0.250 0.160 


0.290 


F640P01 -0003.4 


280041.672 


820968.084 


3.42 


39.82 


7/21/2004 


1 0/29/2004 


4/20/2005 


7/19/05 


8/1/2006 


129 


156 


157 


187 


182.6 


7.60 


1.93 0.155 0.165 


0.670 


F641P01-0000 


280054.484 


820973.004 


0.02 


41.59 


7/21/2004 


1 0/29/2004 




7/19/05 


8/1/2006 


97.3 


97.0 




95.8 


98.8 


8.40 




6.97 


7.84 


F641P01 -0000.8 


280054.484 


820973.004 


0.82 


40.79 


7/21/2004 


1 0/29/2004 




7/19/05 


8/1/2006 


160 


162 




131 


98.5 


2.10 


0.580 


0.920 


0.115 


F641P01-0001.6 


280054.484 


820973.004 


1.62 


39.99 


7/21/2004 


1 0/29/2004 




7/19/05 


8/1/2006 


162 


167 




127 


104.3 


0.500 


0.655 


0.060 


0.005 


F641P01 -0002.2 


280054.484 


820973.004 


2.22 


39.39 


7/21/2004 


1 0/29/2004 




7/19/05 


8/1/2006 


161 


165 




122 


103.2 


0.500 


0.645 


0.050 


0.125 


F641P01 -0003.4 


280054.484 


820973.004 


3.42 


38.19 


7/21/2004 


1 0/29/2004 




7/19/05 


8/1/2006 


159 


144 




133.0 


95.6 


0.100 


0.530 


2.31 


0.380 


F642P0 1-0000 


280057.364 


820984.858 


0.02 


43.60 


7/21/2004 


1 0/29/2004 




7/18/05 


8/1/2006 


101 






99.0 


100.2 


8.40 




2.11 


7.35 


F642P01 -0000.8 


280057.364 


820984.858 


0.82 


42.80 


7/21/2004 


1 0/29/2004 




7/18/05 


8/1/2006 


148 


135 




159 


274 


0.700 


0.385 


0.355 


0.115 


F642P01-0001.6 


280057.364 


820984.858 


1.62 


42.00 


7/21/2004 


1 0/29/2004 




7/18/05 


8/1/2006 


154 


160 




178 


311 


0.400 


2.63 


0.060 


0.080 


F642P0 1-0002.2 


280057.364 


820984.858 


2.22 


41.40 


7/21/2004 


1 0/29/2004 




7/18/05 


8/1/2006 


142 


140 




178 


283 


0.700 


0.260 


0.065 


0.035 


F642P0 1-0003.4 


280057.364 


820984.858 


3.42 


40.20 


7/21/2004 


1 0/29/2004 




7/18/05 


8/1/2006 


149 






158 








0.315 




F643P0 1-0000 


280064.002 


820994.228 


0.02 


43.82 


7/22/2004 


11/1/2004 


4/20/2005 


7/19/05 


8/1/2006 


103 


149 


523 


141 


184 


7.80 


3.12 


2.16 


2.75 


F643P01 -0000.8 


280064.002 


820994.228 


0.82 


43.02 


7/22/2004 


11/1/2004 


4/20/2005 


7/19/05 


8/1/2006 


63.6 




262 


160 




7.30 




0.060 




F643P01-0001.6 


280064.002 


820994.228 


1.62 


42.22 


7/22/2004 


11/1/2004 


4/20/2005 


7/19/05 


8/1/2006 


70.2 


142 


199 


164 


214 


8.20 


0.375 0.000 0.015 


0.725 


F643P0 1-0002.2 


280064.002 


820994.228 


2.22 


41.62 


7/22/2004 


11/1/2004 


4/20/2005 


7/19/05 


8/1/2006 


196 


94.7 


146 


136 


205 


7.80 


3.84 0.280 0.220 


0.330 


F643P0 1-0003.4 


280064.002 


820994.228 


3.42 


40.42 


7/22/2004 


11/1/2004 


4/20/2005 


7/19/05 


8/1/2006 


244 


86.7 


148 


135 


204 


8.10 


8.22 


0.220 


0.440 


F644P01-0000 


280070.882 


820989.998 


0.02 


42.66 


7/22/2004 


1 0/29/2004 




7/19/05 


8/1/2006 


121 


283 




96.1 


102.3 


5.50 


10.51 


7.60 


7.90 


F644P01 -0000.8 


280070.882 


820989.998 


0.82 


41.86 


7/22/2004 


1 0/29/2004 




7/19/05 


8/1/2006 


153 


162 




156 


91.5 


0.700 


0.735 


0.885 


0.260 


F644P01-0001.6 


280070.882 


820989.998 


1.62 


41.06 


7/22/2004 


1 0/29/2004 




7/19/05 


8/1/2006 


154 


164 




159 


89.7 


2.20 


0.820 


0.205 


1.81 


F644P01 -0002.2 


280070.882 


820989.998 


2.22 


40.46 


7/22/2004 


1 0/29/2004 




7/19/05 


8/1/2006 


150 


162 




156 


83.1 


0.100 


0.790 


0.240 


0.530 


F644P01 -0003.4 


280070.882 


820989.998 


3.42 


39.26 


7/22/2004 


1 0/29/2004 




7/19/05 


8/1/2006 


148 


154 




156 


83.8 


4.90 




0.960 


3.38 


F645P01-0000 


280078.725 


820993.792 


0.02 


40.68 


7/22/2004 


11/1/2004 


4/20/2005 


7/19/05 


8/2/2006 


92.3 


93.2 


86.9 


98.0 


99.0 


8.30 


10.53 


8.42 


7.85 


F645P01 -0000.8 


280078.725 


820993.792 


0.82 


39.88 


7/22/2004 


11/1/2004 


4/20/2005 


7/19/05 


8/2/2006 


89.1 


101 


83.4 


143 


98.1 


4.60 


6.03 


0.885 


0.680 


F645P01-0001.6 


280078.725 


820993.792 


1.62 


39.08 


7/22/2004 


11/1/2004 


4/20/2005 


7/19/05 


8/2/2006 


90.3 


173 


87.1 


143 


94.5 


1.90 


5.28 


0.480 


0.130 


F645P0 1-0002.2 


280078.725 


820993.792 


2.22 


38.48 


7/22/2004 


11/1/2004 


4/20/2005 


7/19/05 


8/2/2006 


88.3 


183 


89.9 


147 


95.7 


7.30 


4.63 


0.370 


1.16 


F645P01 -0003.4 


280078.725 


820993.792 


3.42 


37.28 


7/22/2004 


11/1/2004 


4/20/2005 


7/19/05 


8/2/2006 


92.0 


179 


91.2 


138 


96.4 


7.60 


9.45 


0.375 


0.725 


F646P01-0000 


280072.137 


821008.498 


0.02 


43.52 


7/22/2004 


1 0/29/2004 




7/20/05 


8/2/2006 


121 






144 


128 


5.80 




2.35 


5.92 


F646P01 -0000.8 


280072.137 


821008.498 


0.82 


42.72 


7/22/2004 


1 0/29/2004 




7/20/05 


8/2/2006 


151 


242 




180 


221 


0.600 


1 .44 


0.010 


0.660 


F646P01-0001.6 


280072.137 


821008.498 


1.62 


41.92 


7/22/2004 


1 0/29/2004 




7/20/05 


8/2/2006 


150 


212 




189 


220 


1.40 


0.770 


0.035 


0.795 


F646P0 1-0002.2 


280072.137 


821008.498 


2.22 


41.32 


7/22/2004 


1 0/29/2004 




7/20/05 


8/2/2006 


147 


195 




188 


221 




1 .37 


0.125 


2.55 


F646P01 -0003.4 


280072.137 


821008.498 


3.42 


40.12 


7/22/2004 


1 0/29/2004 




7/20/05 


8/2/2006 


116 


195 




193 


217 


0.200 


4.27 




2.11 


F647P01-0000 


280085.138 


821016.427 


0.02 


42.48 


7/23/2004 


11/1/2004 




7/20/05 


8/2/2006 


71.8 


92.2 




94.9 


101 


6.50 


10.60 


8.36 


8.29 


F647P01 -0000.8 


280085.138 


821016.427 


0.82 


41.68 


7/23/2004 


11/1/2004 




7/20/05 


8/2/2006 


69.9 


121 




78.0 


100.0 


6.20 


0.945 


0.550 


0.000 


F647P01-0001.6 


280085.138 


821016.427 


1.62 


40.88 


7/23/2004 


11/1/2004 




7/20/05 


8/2/2006 


69.8 


117 




85.0 


104.0 


6.20 


2.10 


0.000 


0.255 


F647P01 -0002.2 


280085.138 


821016.427 


2.22 


40.28 


7/23/2004 


11/1/2004 




7/20/05 


8/2/2006 


69.9 


116 




79.0 


101.0 


6.00 


0.420 


2.15 


2.58 


F647P01 -0003.4 


280085.138 


821016.427 


3.42 


39.08 


7/23/2004 


11/1/2004 




7/20/05 


8/2/2006 


69.7 


148 




71.5 


94.2 


6.00 


5.28 


6.47 


6.49 


F648P01-0000 


280084.569 


821029.386 


0.02 


43.30 


7/23/2004 


1 0/29/2004 




7/20/05 


8/2/2006 


94.9 






95.7 


146 


6.77 




9.10 


0.075 


F648P01 -0000.8 


280084.569 


821029.386 


0.82 


42.50 


7/23/2004 


1 0/29/2004 




7/20/05 


8/2/2006 


100 


155 




161 


137 


4.40 


0.890 


0.060 


1.91 


F648P01-0001.6 


280084.569 


821029.386 


1.62 


41.70 


7/23/2004 


1 0/29/2004 




7/20/05 


8/2/2006 


104 


205 




160 


135 


2.65 


2.39 


0.125 


4.32 


F648P0 1-0002.2 


280084.569 


821029.386 


2.22 


41.10 


7/23/2004 


1 0/29/2004 




7/20/05 


8/2/2006 


102 


247 




157 


137 


2.10 


1.90 


0.240 


4.87 


F648P01 -0003.4 


280084.569 


821029.386 


3.42 


39.90 


7/23/2004 


1 0/29/2004 




7/20/05 


8/2/2006 


101 


121 




137 


134 


2.30 


1 .96 


4.64 


6.74 



U.S. Geological Survey 



Ashumet Pond Geochemical Barrier - August 2006 



Table 1. Field and laboratory chemical analysis of samples from vertical pond-bottom multilevel samplers collected prior to installation, and two, eight, 1 1 and 23 months after barrier msta\\at(otmtinued) 





PH 




Ammonia (mg/L as 


N) 




Nitrite plus nitrate (mg/L as N) 




















Post 5 










Post5 




Pre 


Postl 


Post 2 


Post 3 Post 5 


Pre 


Postl 


Post 2 


Post 3 


August 


Pre 


Postl 


Post 2 


Post 3 


August 


USGS Site Name 


July 2004 


October 2004 


April 2005 


July 2005 August 2006 


July 2004 


October 2004 


April 2005 


July 2005 


2006 


July 2004 


October 2004 


April 2005 


July 2005 


2006 


F639P01-0000 










<0.04 










<0.06 










F639P01 -0000.8 










<0.04 










2.45 










F639P01-0001.6 


5.91 




























F639P01 -0002.2 


5.98 




























F639P01 -0003.4 


6.94 








<0.04 










3.22 










F640P01-0000 


7.23 




























F640P01 -0000.8 


6.48 








E0.04 










0.14 










F640P01-0001.6 


6.49 




























F640P01 -0002.2 


6.58 




























F640P01 -0003.4 


6.64 








0.41 










<0.06 










F641P01-0000 


7.29 




























F641P01 -0000.8 


6.66 








0.79 










<0.06 










F641P01-0001.6 


6.94 




























F641P01 -0002.2 


6.63 




























F641P01 -0003.4 


6.86 








0.86 










<0.06 










F642P0 1-0000 


7.23 








<0.04 










<0.06 










F642P01 -0000.8 


6.61 








0.04 










<0.06 










F642P01-0001.6 


6.66 








E0.04 










<0.06 










F642P01 -0002.2 


6.61 








0.04 










<0.06 










F642P0 1-0003.4 


6.65 








0.04 










<0.06 










F643P0 1-0000 


6.43 


6.90 


6.92 


7.02 5.74 




0.05 


<0.04 


E0.028 


0.57 




<0.06 


<0.06 


<0.06 


<0.06 


F643P01 -0000.8 


6.02 




6.75 


7.15 


<0.04 




0.079 


<0.04 




<0.06 




<0.06 


<0.06 




F643P01-0001.6 


6.36 


6.95 


7.10 


7.13 5.00 




<0.04 


0.029 


E0.039 


0.77 




<0.06 


<0.06 


<0.06 


<0.06 


F643P0 1-0002.2 


6.27 


5.81 


6.46 


6.60 5.45 




<0.04 


<0.04 


0.079 


0.79 




<0.06 


<0.06 


<0.06 


<0.06 


F643P01 -0003.4 


6.4 


5.79 


6.32 


6.56 


<0.04 


<0.04 


<0.04 


0.145 


0.82 


0.33 


<0.06 


<0.06 


<0.06 


<0.06 


F644P01-0000 


7.02 




























F644P01 -0000.8 


6.5 








1.25 










<0.06 










F644P01-0001.6 


6.81 




























F644P01 -0002.2 


6.83 




























F644P01 -0003.4 


6.65 








1.23 










<0.06 










F645P01-0000 


7.19 


5.95 


6.32 


6.95 


<0.04 


<0.04 


<0.04 




E0.009 


0.68 


0.05 


0.93 




<0.06 


F645P01 -0000.8 


6.66 


6.20 


5.67 


6.25 


<0.04 


<0.04 


<0.04 


<0.04 


1.21 


0.81 


0.80 


0.96 


1.66 


1.99 


F645P01-0001.6 


6.48 


6.36 


6.32 


6.20 


<0.04 


<0.04 


<0.04 


<0.04 


1.51 


0.82 


0.85 


0.90 


1.90 


2.13 


F645P0 1-0002.2 


6.64 


6.35 


6.00 


6.15 


<0.04 


<0.04 


<0.04 


<0.04 


1.45 


0.83 


<0.06 


0.98 


1.84 


1.97 


F645P01 -0003.4 


6.98 


6.32 


6.64 


6.12 


<0.04 


<0.04 


<0.04 


<0.04 


1.59 


0.17 


0.69 


0.92 


1.80 


2.12 


F646P01-0000 


6.42 




























F646P01 -0000.8 


6.17 








E0.03 










<0.06 










F646P01-0001.6 


6.34 




























F646P0 1-0002.2 


6.43 




























F646P01 -0003.4 


6.25 








0.43 










<0.06 










F647P01-0000 


6.53 


7.14 




6.99 


<0.04 


<0.04 




<0.04 


E0.007 


0.47 


<0.06 




<0.06 


<0.06 


F647P01 -0000.8 


6.43 


6.92 




7.00 


<0.04 


<0.04 




<0.04 


0.01 


0.48 


<0.06 




<0.06 


<0.06 


F647P01-0001.6 


6.57 


7.07 




7.07 


<0.04 


<0.04 




E0.020 


0.02 


0.47 


<0.06 




<0.06 


E0.04 


F647P01 -0002.2 


6.23 


7.00 




6.56 


<0.04 


<0.04 




<0.04 


<0.01 


0.47 


0.04 




0.30 


0.36 


F647P01 -0003.4 


6.45 


4.86 




5.72 


<0.04 


<0.04 




<0.04 


<0.01 


0.47 


0.30 




0.60 


0.71 


F648P0 1-0000 


6.21 




























F648P01 -0000.8 


6.01 








<0.04 










0.45 










F648P01-0001.6 


6.11 




























F648P0 1-0002.2 


6.15 




























F648P01 -0003.4 


6.24 








<0.04 










0.35 











U.S. Geological Survey 



Ashumet Pond Geochemical Barrier - August 2006 



Table 1. Field and laboratory chemical analysis of samples from vertical pond-bottom multilevel samplers collected prior to installation, and two, eight, 1 1 
and 23 months after barrier installation Continued ). 







Nitrite 


(mg/L as 


N) 






Phosphorus (mg/L 


asP) 
















Post 5 
















Pre 


Postl 


Post 2 


Post 3 


August 


Pre 


Postl 


Post 2 


Post 3 


Post5 


USGS Site Name 


July 2004 


October 2004 


April 2005 


July 2005 


2006 


July 2004 


October 2004 


April 2005 


July 2005 


August 2006 


F639P01 


0000 


<0.008 










0.05 


0.03 




0.04 


<0.02 


F639P01 


0000.8 


<0.008 










<0.01 


0.65 




0.73 


1.10 


F639P01 


0001.6 












<0.01 


0.74 




0.79 


1.09 


F639P01 


0002.2 












<0.01 


0.73 




0.76 


1.08 


F639P01 


0003.4 


<0.008 










<0.01 


0.80 




0.81 


1.11 


F640P01 


0000 












0.20 


0.02 


0.08 


0.11 


0.09 


F640P01 


0000.8 


E0.005 










1.67 


0.08 


0.46 


0.17 


0.15 


F640P01 


0001.6 












1.20 


0.07 


0.77 


0.89 


0.31 


F640P01 


0002.2 












1.15 


0.96 


1.51 


1.06 


0.68 


F640P01 


0003.4 


<0.008 










1.06 


1.42 


1.51 


1.03 


0.75 


F641P01 


0000 












0.06 


<0.02 




E0.02 


<0.02 


F641P01 


0000.8 


<0.008 










1.20 


1.23 




0.16 


<0.02 


F641P01 


0001.6 












1.04 


1.03 




0.20 


0.04 


F641P01 


0002.2 












1.00 


0.36 




0.28 


0.08 


F641P01 


0003.4 


<0.008 










1.12 


1.21 




0.86 


0.43 


F642P01 


0000 


<0.008 










0.33 






0.03 


<0.02 


F642P01 


0000.8 


<0.008 










1.46 


0.04 




1.50 


0.97 


F642P01 


0001.6 


<0.008 










1.45 


<0.02 




0.06 


<0.02 


F642P01 


0002.2 


<0.008 










1.45 


<0.02 




0.05 


<0.02 


F642P01 


0003.4 


<0.008 










1.38 






1.20 




F643P01 


0000 




<0.008 


<0.008 


<0.008 


<0.002 


0.14 


<0.02 


0.55 


0.10 


0.16 


F643P01 


0000.8 


<0.008 




<0.008 


<0.008 




0.26 




<0.02 


0.03 




F643P01 


0001.6 




<0.008 


<0.008 


<0.008 


<0.002 


0.28 


0.04 


0.36 


0.16 


0.18 


F643P01 


0002.2 




<0.008 


<0.008 


<0.008 


<0.002 


0.52 


0.22 


2.66 


1.68 


1.41 


F643P01 


0003.4 


<0.008 


<0.008 


<0.008 


<0.008 


<0.002 


1.05 


0.35 


2.84 


1.84 


1.46 


F644P01 


0000 












0.49 


0.03 




0.02 


<0.02 


F644P01 


0000.8 


<0.008 










1.71 


0.15 




0.19 


0.09 


F644P01 


0001.6 












1.70 


0.85 




0.26 


0.14 


F644P01 


0002.2 












1.61 


1.33 




0.45 


0.37 


F644P01 


0003.4 


<0.008 










1.71 


2.03 




1.07 


0.58 


F645P01 


0000 


<0.008 


<0.008 


<0.008 




<0.002 


0.59 


0.02 


0.35 


0.02 


<0.02 


F645P01 


0000.8 


<0.008 


<0.008 


<0.008 


0.043 


<0.002 


0.69 


0.36 


0.41 


0.44 


0.46 


F645P01 


0001.6 


<0.008 


<0.008 


<0.008 


0.043 


<0.002 


0.70 


0.43 


0.36 


0.42 


0.63 


F645P01 


0002.2 


<0.008 


<0.008 


<0.008 


0.031 


<0.002 


0.63 


0.42 


0.40 


0.50 


0.59 


F645P01 


0003.4 


<0.008 


<0.008 


<0.008 


0.025 


<0.002 


0.15 


0.40 


0.31 


0.46 


0.64 


F646P01 


0000 












0.77 






0.23 


0.10 


F646P01 


0000.8 


<0.008 










1.37 


0.04 




0.61 


0.34 


F646P01 


0001.6 












1.40 


0.10 




2.79 


1.48 


F646P01 


0002.2 












1.05 


0.24 




3.08 


1.46 


F646P01 


0003.4 


<0.008 










1.45 


0.92 




2.65 


1.37 


F647P01 


0000 


<0.008 


<0.008 




<0.008 


<0.002 


0.73 


<0.02 




E0.01 


<0.02 


F647P01 


0000.8 


<0.008 


<0.008 




0.011 


E0.0013 


0.72 


0.10 




0.05 


E0.015 


F647P01 


0001.6 


<0.008 


<0.008 




0.016 


0.003 


0.71 


0.09 




0.03 


<0.02 


F647P01 


0002.2 


<0.008 


<0.008 




E0.004 


0.007 


0.71 


0.03 




<0.02 


<0.02 


F647P01 


0003.4 


<0.008 


<0.008 




<0.008 


<0.002 


0.73 


0.63 




0.55 


0.41 


F648P01 


0000 












0.51 






E0.02 


0.03 


F648P01 


0000.8 


<0.008 










0.70 


<0.02 




0.04 


<0.02 


F648P01 


0001.6 












0.83 


<0.02 




0.04 


0.16 


F648P01 


0002.2 












0.92 


<0.02 




0.05 


0.08 


F648P01 


0003.4 


<0.008 










0.94 


0.30 




0.09 


0.33 



U.S. Geological Survey 



Ashumet Pond Geochemical Barrier - August 2006 



Table 2. Field chemical analysis of samples collected from vertical diffusion samplers collected 2, 11, and 23 months after barrier installation. 

[Location of sites shown in figure 2. DC shorthand for < nil I fall 1 1 I i re determined on October 6 2004 by the U.S. Geological Survey. Field phosphate 

determined onsite using a colorimetric method. mS/cm, tnicrosiemens per centimeter at 25oC; — , none data ] 



October 2004 



July 2005 



August 2006 







Mid-Port Depth 
























Pond- 


Below Pond 






Specific 






Specific 






Specific 




USGS Site 


Bottom 


Bottom 


Altitude of 


Colored Film 


Conductance 


Field Phosphate 


Colored Film 


Conductance 


Field Phosphate 


Colored Film 


Conductance 


Field Phosphate 


Name 


Altitude 

42.67 


(feet) 

-0.05 


Port (feet) 

42.72 


on Bottles 


(|iS/cm) 


(mg/L as P) 


on Bottles 


(|iS/cm) 


(mg/L as P) 


on Bottles 


(|iS/cm) 


(mg/L as P) 


DC1-01 


reddish brown 


96.7 


0.00 


none 


186 


0.82 


none 


136 


1.24 


DC1-02 


42.67 


0.12 


42.55 


reddish brown 


183 


0.44 


none 


181 


0.82 


none 


122 


1.24 


DC1-03 


42.67 


0.29 


42.38 


reddish brown 


108 


0.23 


none 


183 


0.80 


none 


130 


1.14 


DC1-04 


42.67 


0.46 


42.21 


reddish brown 


63.8 


0.08 


none 


181 


0.73 


none 


126 


1.21 


DC1-05 


42.67 


0.63 


42.04 


reddish brown 


177 


0.46 


none 


187 


0.73 


none 


132 


1.06 


DC1-06 


42.67 


0.80 


41.87 


reddish brown 


176 


0.42 


none 


187 


0.78 


none 


127 


1.17 


DC1-07 


42.67 


0.97 


41.70 


reddish brown 


219 


0.42 


none 


179 


0.75 


none 


138 


1.04 


DC1-08 


42.67 


1.14 


41.53 


reddish brown 


189 


0.38 


none 


180 


0.83 


none 


136 


1.37 


DC1-09 


42.67 


1.31 


41.36 


reddish brown 


191 


0.42 


none 


185 


0.91 


none 


126 


1.61 


DC1-10 


42.67 


1.64 


41.03 


reddish brown 


194 


0.47 


none 


191 


0.80 


none 


139 


1.35 


DC1-11 


42.67 


1.97 


40.70 


none 


201 


0.47 


none 


186 


0.82 


none 


128 


1.32 


DC1-12 


42.67 


2.30 


40.37 


none 


202 


0.69 


none 


185 


0.80 


none 


141 


1.52 


DC1-13 


42.67 


2.63 


40.04 


none 


202 


0.59 


none 


187 


0.72 


none 


138 


1.30 


DC2-01 


43.22 


0.16 


43.06 


reddish brown 


104 


0.10 


reddish brown 


198 


0.08 


reddish brown 


173 


0.47 


DC2-02 


43.22 


0.33 


42.89 


reddish brown 


99.5 


0.00 


reddish brown 


188 


0.00 


reddish brown 


174 


0.39 


DC2-03 


43.22 


0.50 


42.72 


reddish brown 


92.8 


0.07 


reddish brown 


183 


0.02 


reddish brown 


173 


0.41 


DC2-04 


43.22 


0.67 


42.55 


reddish brown 


106 


0.00 


reddish brown 


182 


0.00 


reddish brown 


153 


0.24 


DC2-05 


43.22 


0.84 


42.38 


reddish brown 


97.7 


0.00 


reddish brown 


180 


0.00 


reddish brown 


162 


0.24 


DC2-06 


43.22 


1.01 


42.21 


reddish brown 


96.3 


0.00 


reddish brown 


184 


0.00 


reddish brown 


155 


0.08 


DC2-07 


43.22 


1.18 


42.04 


reddish brown 


95.0 


0.03 


reddish brown 


196 


0.11 


reddish brown 


168 


0.26 


DC2-08 


43.22 


1.35 


41.87 


reddish brown 


96.1 


0.02 


reddish brown 


202 


0.18 


reddish brown 


189 


0.08 


DC2-09 


43.22 


1.52 


41.70 


reddish brown 


85.4 


0.00 


reddish brown 


186 


0.20 


reddish brown 


178 


0.05 


DC2-10 


43.22 


1.85 


41.37 


reddish brown 


96.8 


0.59 


reddish brown 


183 


0.29 


reddish brown 


190 


0.42 


DC2-1 1 


43.22 


2.18 


41.04 


none 


109 


0.49 


none 


193 


0.96 


none 


165 


0.75 


DC2-12 


43.22 


2.51 


40.71 


none 


109 


0.52 


none 


185 


1.04 


none 


180 


1.03 


DC2-13 


43.22 


2.84 


40.38 


none 


102 


0.60 


none 


182 


1.09 


none 


177 


1.11 


DC3-01 


43.22 


0.10 


43.12 


reddish brown 


153 


0.05 


reddish brown 


138 


0.10 


gray 


192 


0.08 


DC3-02 


43.22 


0.27 


42.95 


reddish brown 


158 


0.00 


reddish brown 


114 


0.10 


gray 


197 


0.00 


DC3-03 


43.22 


0.44 


42.78 


reddish brown 


142 


0.00 


reddish brown 


122 


0.00 


reddish brown 


193 


0.00 


DC3-04 


43.22 


0.61 


42.61 


reddish brown 


134 


0.00 


reddish brown 


89.4 


0.03 


reddish brown 


194 


0.00 


DC3-05 


43.22 


0.78 


42.44 


reddish brown 


138 


0.00 


reddish brown 


128 


0.02 


reddish brown 


192 


0.00 


DC3-06 


43.22 


0.95 


42.27 


reddish brown 


152 


0.00 


reddish brown 


134 


0.03 


reddish brown 


190 


0.00 


DC3-07 


43.22 


1.12 


42.10 


reddish brown 


138 


0.02 


reddish brown 


154 


0.11 


gray 


192 


0.02 


DC3-08 


43.22 


1.29 


41.93 


reddish brown 


124 


0.02 


reddish brown 


158 


0.15 


gray 


193 


0.00 


DC3-09 


43.22 


1.46 


41.76 


reddish brown 


123 


0.11 


reddish brown 


160 


0.10 


gray 


189 


0.00 


DC3-10 


43.22 


1.79 


41.43 


reddish brown 


116 


0.00 


reddish brown 


170 


0.18 


gray 


191 


0.00 


DC3-1 1 


43.22 


2.12 


41.10 


none 


112 


0.03 


reddish brown 


168 


0.67 


gray 


197 


0.00 


DC3-12 


43.22 


2.45 


40.77 


none 


96.5 


0.62 


reddish brown 


154 


1.37 


none 


189 


1.24 


DC3-13 


43.22 


2.78 


40.44 


none 


105 


1.29 


none 


156 


1.63 


none 


192 


1.58 


DC4-01 


43.78 


0.31 


43.47 


reddish brown 


111 


0.13 


reddish brown 


132 


0.07 


none 


204 


0.55 


DC4-02 


43.78 


0.48 


43.30 


reddish brown 


102 


0.08 


reddish brown 


124 


0.03 


reddish brown 


200 


0.08 


DC4-03 


43.78 


0.65 


43.13 


reddish brown 


115 


0.08 


reddish brown 


122 


0.03 


reddish brown 


205 


0.10 


DC4-04 


43.78 


0.82 


42.96 


reddish brown 


91.8 


0.03 


reddish brown 


118 


0.03 


reddish brown 


203 


0.00 


DC4-05 


43.78 


0.99 


42.79 


reddish brown 


107 


0.13 


reddish brown 


115 


0.00 


reddish brown 


204 


0.00 


DC4-06 


43.78 


1.16 


42.62 


reddish brown 


125 


0.05 


reddish brown 


120 


0.03 


gray 


204 


0.00 



Page 1 of 3 



U.S. Geological Survey 



Ashumet Pond Geochemical Barrier - August 2006 



October 2004 



July 2005 



August 2006 







Mid-Port Depth 
























Pond- 


Below Pond 






Specific 






Specific 






Specific 




USGS Site 


Bottom 


Bottom 


Altitude of 


Colored Film 


Conductance 


Field Phosphate 


Colored Film 


Conductance 


Field Phosphate 


Colored Film 


Conductance 


Field Phosphate 


Name 


Altitude 

43.78 


(feet) 

1.33 


Port (feet) 

42.45 


on Bottles 


(|iS/cm) 


(mg/L as P) 


on Bottles 


(|iS/cm) 


(mg/L as P) 


on Bottles 


(|iS/cm) 


(mg/L as P) 


DC4-07 


reddish brown 


128 


0.02 


reddish brown 


124 


0.00 


gray 


210 


0.00 


DC4-08 


43.78 


1.50 


42.28 


reddish brown 


141 


0.08 


reddish brown 


133 


0.00 


gray 


204 


0.00 


DC4-09 


43.78 


1.67 


42.11 


reddish brown 


159 


0.11 


reddish brown 


129 


0.00 


gray 


203 


0.00 


DC4-10 


43.78 


2.00 


41.78 


reddish brown 


136 


0.03 


reddish brown 


136 


0.02 


gray 


211 


0.00 


DC4-1 1 


43.78 


2.33 


41.45 


reddish brown 


98.4 


0.00 


reddish brown 


127 


0.91 


none 


196 


0.95 


DC4-12 


43.78 


2.66 


41.12 


none 


104 


0.15 


reddish brown 


121 


1.34 


none 


196 


1.06 


DC4-13 


43.78 


2.99 


40.79 


none 


103 


0.28 


none 


133 


1.73 


none 


190 


1.30 


DC5-01 


42.69 


-0.02 


42.71 


reddish brown 


240 


0.02 


reddish brown 


202 


0.34 


reddish brown 


127 


0.44 


DC5-02 


42.69 


0.15 


42.54 


reddish brown 


220 


0.00 


reddish brown 


198 


0.16 


gray 


130 


0.44 


DC5-03 


42.69 


0.32 


42.37 


reddish brown 


225 


0.00 


reddish brown 


199 


0.13 


gray 


133 


0.26 


DC5-04 


42.69 


0.49 


42.20 


reddish brown 


227 


0.00 


reddish brown 


199 


0.11 


gray 


135 


0.38 


DC5-05 


42.69 


0.66 


42.03 


reddish brown 


221 


0.03 


reddish brown 


194 


0.05 


gray 


129 


0.44 


DC5-06 


42.69 


0.83 


41.86 


reddish brown 


221 


0.03 


reddish brown 


195 


0.23 


gray 


129 


0.42 


DC5-07 


42.69 


1.00 


41.69 


reddish brown 


216 


0.00 


reddish brown 


193 


0.11 


gray 


128 


0.39 


DC5-08 


42.69 


1.17 


41.52 


reddish brown 


234 


0.16 


reddish brown 


197 


0.15 


gray 


130 


0.33 


DC5-09 


42.69 


1.34 


41.35 


reddish brown 


228 


0.86 


reddish brown 


196 


0.15 


gray 


128 


0.41 


DC5-10 


42.69 


1.67 


41.02 


reddish brown 


221 


0.52 


reddish brown 


200 


0.15 


gray 


130 


0.64 


DC5-1 1 


42.69 


2.00 


40.69 


reddish brown 


203 


0.86 


reddish brown 


195 


0.07 


reddish brown 


131 


0.52 


DC5-12 


42.69 


2.33 


40.36 


none 


157 


0.85 


none 


193 


1.35 


reddish brown 


132 


1.39 


DC5-13 


42.69 


2.66 


40.03 


none 


151 


1.37 


none 


188 


1.29 


none 


121 


1.42 


DC6-01 


42.22 


-0.18 


42.40 


reddish brown 


101 


0.02 


reddish brown 


101 


0.00 


gray 


... 


0.00 


DC6-02 


42.22 


-0.01 


42.23 


reddish brown 


122 


0.00 


reddish brown 


122 


0.00 


reddish brown 


100 


0.02 


DC6-03 


42.22 


0.16 


42.06 


reddish brown 


154 


0.10 


reddish brown 


154 


0.11 


reddish brown 


86.6 


0.02 


DC6-04 


42.22 


0.33 


41.89 


reddish brown 


161 


0.07 


reddish brown 


161 


0.13 


reddish brown 


84.9 


0.13 


DC6-05 


42.22 


0.50 


41.72 


reddish brown 


164 


0.13 


reddish brown 


164 


0.16 


reddish brown 


86.4 


0.07 


DC6-06 


42.22 


0.67 


41.55 


reddish brown 


163 


0.15 


reddish brown 


142 


0.15 


gray 


98.7 


0.03 


DC6-07 


42.22 


0.84 


41.38 


reddish brown 


153 


0.08 


reddish brown 


138 


0.03 


gray 


80.3 


0.02 


DC6-08 


42.22 


1.01 


41.21 


reddish brown 


147 


0.05 


reddish brown 


142 


0.07 


gray 


92.9 


0.05 


DC6-09 


42.22 


1.18 


41.04 


reddish brown 


156 


0.18 


reddish brown 


144 


0.08 


gray 


86.6 


0.07 


DC6-10 


42.22 


1.51 


40.71 


reddish brown 


145 


0.05 


reddish brown 


143 


0.18 


gray 


83.6 


0.10 


DC6-1 1 


42.22 


1.84 


40.38 


reddish brown 


141 


0.83 


reddish brown 


140 


0.33 


gray 


83.4 


0.72 


DC6-12 


42.22 


2.17 


40.05 


none 


143 


1.08 


reddish brown 


146 


1.22 


none 


87.9 


0.70 


DC6-13 


42.22 


2.50 


39.72 


none 


148 


1.26 


none 


146 


1.03 


none 


132 


0.73 


DC7-01 


43.72 


-0.26 


43.98 


reddish brown 


... 


... 


reddish brown 


98 


0.05 


reddish brown 


105 


0.08 


DC7-02 


43.72 


-0.09 


43.81 


reddish brown 


... 


... 


reddish brown 


98 


0.03 


reddish brown 


153 


0.10 


DC7-03 


43.72 


0.08 


43.64 


reddish brown 


83 


0.00 


reddish brown 


186 


0.03 


reddish brown 


189 


0.51 


DC7-04 


43.72 


0.25 


43.47 


reddish brown 


81 


0.00 


reddish brown 


189 


0.00 


reddish brown 


193 


0.54 


DC7-05 


43.72 


0.42 


43.30 


reddish brown 


87 


0.00 


reddish brown 


194 


0.00 


reddish brown 


188 


0.33 


DC7-06 


43.72 


0.59 


43.13 


reddish brown 


87.6 


0.00 


reddish brown 


199 


0.00 


gray 


183 


0.18 


DC7-07 


43.72 


0.76 


42.96 


reddish brown 


91.3 


0.00 


reddish brown 


197 


0.00 


gray 


190 


0.21 


DC7-08 


43.72 


0.93 


42.79 


reddish brown 


93.5 


0.00 


reddish brown 


200 


0.00 


gray 


187 


0.21 


DC7-09 


43.72 


1.10 


42.62 


reddish brown 


94.7 


0.00 


reddish brown 


199 


0.00 


gray 


194 


0.39 


DC7-10 


43.72 


1.43 


42.29 


reddish brown 


103 


0.00 


reddish brown 


200 


0.08 


gray 


204 


0.33 


DC7-1 1 


43.72 


1.76 


41.96 


reddish brown 


102 


0.00 


reddish brown 


201 


0.00 


none 


171 


1.13 


DC7-12 


43.72 


2.09 


41.63 


reddish brown 


95.7 


0.00 


none 


198 


1.13 


none 


186 


0.54 


DC7-13 


43.72 


2.42 


41.30 


reddish brown 


82.4 


0.00 


none 


225 


0.91 


none 


244 


1.03 


DC8-01 


43.46 


-0.02 


43.48 


reddish brown 


102 


0.00 


reddish brown 


109 


0.00 


reddish brown 


132 


0.03 


DC8-02 


43.46 


0.15 


43.31 


reddish brown 


150 


0.00 


reddish brown 


138 


0.13 


reddish brown 


138 


0.05 



Page 2 of 3 



U.S. Geological Survey 



Ashumet Pond Geochemical Barrier - August 2006 



October 2004 



July 2005 



August 2006 







Mid-Port Depth 




























Pond- 


Below Pond 






Specific 








Specific 








Specific 




USGS Site 


Bottom 


Bottom 


Altitude of 


Colored Film 


Conductance 


Field Phosphate 


Colored Film 


Conductance 


Field Phosphate 


Colored Film 


Conductance 


Field Phosphate 


Name 


Altitude 

43.46 


(feet) 

0.32 


Port (feet) 

43.14 


on Bottles 


(|iS/cm) 


(mg/L as 


P) 


on Bottles 


(|iS/cm) 


(mg/L as 


P) 


on Bottles 


(|iS/cm) 


(mg/L as P) 


DC8-03 


reddish brown 


150 


0.00 




reddish brown 


140 


0.00 




reddish brown 


154 


0.05 


DC8-04 


43.46 


0.49 


42.97 


reddish brown 


132 


0.00 




reddish brown 


142 


0.00 




reddish brown 


149 


0.07 


DC8-05 


43.46 


0.66 


42.80 


reddish brown 


132 


0.00 




reddish brown 


134 


0.00 




reddish brown 


139 


0.00 


DC8-06 


43.46 


0.83 


42.63 


reddish brown 


146 


0.00 




reddish brown 


137 


0.03 




reddish brown 




0.00 


DC8-07 


43.46 


1.00 


42.46 


reddish brown 


124 


0.00 




reddish brown 


129 


0.05 




reddish brown 


154 


0.05 


DC8-08 


43.46 


1.17 


42.29 


reddish brown 


175 


0.00 




reddish brown 


128 


0.07 




reddish brown 


145 


0.07 


DC8-09 


43.46 


1.34 


42.12 


reddish brown 


166 


0.00 




reddish brown 


131 


0.07 




reddish brown 


145 


0.31 


DC8-10 


43.46 


1.67 


41.79 


reddish brown 


187 


0.00 




reddish brown 


132 


0.03 




reddish brown 


142 


0.20 


DC8-1 1 


43.46 


2.00 


41.46 


reddish brown 


167 


0.00 




reddish brown 


125 


0.05 




reddish brown 


126 


0.24 


DC8-12 


43.46 


2.33 


41.13 


none 


153 


0.00 




reddish brown 


117 


0.02 




reddish brown 


128 


0.23 


DC8-13 


43.46 


2.66 


40.80 


none 


193 


0.00 




reddish brown 


132 


0.23 




reddish brown 


193 


0.23 



Page 3 of 3 



U.S. Geological Survey 



Ashumet pond Geochemical Barrier - August 2006 



Table 3. Location data and field chemical analysis of samples collected from four horizontal multiport samplers installed at 0.5 and 3.0 feet below the pond bottom along two transects in the geochemical barrier. 

[Location of sites shown in figure 2. Dissolved oxygen and field phosphate were determined onsite using a colorimetric method. mg/L, milligrams per liter; 
uS/cm, microsiemens per centimeter at 25C; — , no analysis] 





Line Description 


Depth Below 

Pond Bottom 

(feet) 


Distance from 

Mean Shore 

(feet) 


October 28, 2004 




July 21 


2005 




November 10, 2005 


August 8, 2006 


Line 
Number 


Specific 
Conductance 

(uS/cm) 


units) 
(mg/L) 


Field 
Phosphate, 
dissolved 
(mg/L as P) 


Specific 
Conductance 

(uS/cm) 


Oxygen, 
dissolved 
(mg/L) 


pH (standard 
units) 


Field 
Phosphate, 
dissolved 
(mg/L as P) 


Specific 
Conductance 

(uS/cm) 


Field 
dis X s y oTve'd PH (^"dard Phosphate, 
units) dissolved 
(mg/L) (mg/L as P) 


Specific 
Conductance 

(uS/cm) 


units) 
(mg/L) 


Field 
Phosphate, 
dissolved 
(mg/L as P) 




South 


0.5 


-1.1 


29.0 


7.60 10.960 


0.00 


258 


0.00 


6.93 


0.18 


104 


0.00 


0.10 


249 


0.02 6.80 


0.02 




South 


0.5 


1.8 


69.7 


7.75 10.190 


0.00 


235 


0.00 


6.94 


0.03 


166 


0.00 


0.10 


191 


0.00 7.06 


0.02 




South 


0.5 


4.7 








157 


0.00 


6.86 


0.05 


166 


0.00 


0.00 


148 


0.00 7.05 


0.03 




South 


0.5 


7.6 


142 


7.73 9.500 


0.00 


122 


1.70 


7.08 


0.03 


137 


3.77 


0.00 


119 


3.54 6.73 


0.00 




South 


0.5 


10.5 


119 


7.98 4.580 


0.00 


115 


1.88 


7.31 


0.10 


143 


3.68 


0.00 


167 


0.16 6.75 


0.03 




South 


0.5 


13.4 


114 


8.39 2.950 


0.00 


113 


2.22 


8.18 


0.03 


178 


0.80 


0.00 


163 


0.19 7.09 


0.02 




South 


0.5 


16.3 


110 


8.21 0.050 


0.00 


120 


1.70 


7.72 


0.11 


209 


0.01 


0.02 


177 


0.00 7.41 


0.15 




South 


0.5 


19.2 


214 


7.60 0.040 


0.00 


134 


0.00 


7.99 


0.13 


170 


0.02 


0.00 


133 


0.06 7.60 


0.20 




South 


0.5 


22.1 


245 


7.39 0.010 


0.05 


163 


0.00 


8.34 


0.11 


165 


0.00 


0.02 


153 


0.02 7.70 


0.36 




South 


0.5 


25.0 


238 


7.71 0.010 


0.02 


152 


0.00 


8.31 


0.18 


159 


0.02 


0.07 


163 


0.00 7.63 


0.29 




South 


0.5 


27.9 


231 


7.41 0.005 


0.02 


156 


0.00 


8.53 


0.28 


176 


0.00 


0.10 


172 


0.00 7.58 


0.28 




South 


0.5 


30.8 


186 


8.21 0.115 


0.00 


117 


0.01 


8.75 


0.23 


178 


0.06 


0.08 


127 


0.07 7.91 


0.28 




South 


0.5 


33.7 


176 


7.65 0.065 


0.00 


115 


0.02 


8.14 


0.33 


202 


0.01 


0.13 


107 


0.00 7.59 


0.28 




South 


0.5 


36.6 


168 


7.68 0.035 


0.10 


132 


0.00 


7.97 


0.16 


192 


0.01 


0.08 


103 


0.00 7.27 


0.05 




South 


0.5 


39.5 


171 


7.23 2.590 


0.05 


130 


0.56 


7.55 


0.07 


149 


0.24 


0.03 


106 


0.23 7.16 


0.03 




South 


3.0 


-1.1 


110 


6.19 0.010 


0.03 


181 


0.04 


6.08 


1.03 


64.1 


8.43 


0.10 


206 


0.20 5.98 


1.50 




South 


3.0 


1.8 


98.8 


5.23 0.000 


0.03 


192 


0.10 


6.32 


0.86 


133 


4.52 


0.70 


177 


0.14 6.03 


1.44 




South 


3.0 


4.7 


63.1 


5.34 0.105 


0.03 


172 


0.03 


6.32 


1.40 


171 


0.03 


0.96 


189 


0.12 5.98 


1.34 




South 


3.0 


7.6 


99.9 


5.81 0.115 


0.02 


164 


0.05 


6.51 


1.11 


185 


0.07 


1 .04 


216 


0.06 6.00 


1.17 




South 


3.0 


10.5 


131 


6.91 0.710 


0.05 


159 


0.06 


6.83 


1.13 


250 


0.01 


0.31 


252 


0.09 6.14 


1.16 




South 


3.0 


13.4 


104 


6.68 0.255 


0.05 


164 


0.01 


7.05 


0.73 


247 


0.00 


0.23 


272 


0.02 6.52 


0.91 




South 


3.0 


16.3 


86.1 


6.91 0.685 


0.00 


171 


0.04 


7.11 


1.14 


260 


0.02 


0.64 


220 


0.01 6.86 


0.91 




South 


3.0 


19.2 


165 


6.89 0.015 


0.03 


189 


0.00 


7.25 


1.27 


247 


0.04 


0.95 


181 


0.07 7.14 


1.32 




South 


3.0 


22.1 


234 


6.95 0.015 


0.36 


211 


0.00 


7.53 


0.72 


174 


0.02 


0.15 


164 


0.05 7.61 


0.46 




South 


3.0 


25.0 


238 


7.12 0.005 


0.88 


200 


0.00 


7.62 


0.39 


159 


0.02 


0.02 


169 


0.07 7.55 


0.33 




South 


3.0 


27.9 


230 


7.17 0.025 


0.36 


186 


0.00 


7.88 


0.24 


176 


0.02 


0.05 


179 


0.00 7.48 


0.21 




South 


3.0 


30.8 


225 


7.34 0.005 


0.47 


154 


0.00 


8.00 


0.24 


182 


0.02 


0.05 


149 


0.00 7.35 


0.18 




South 


3.0 


33.7 


196 


7.31 0.020 


0.29 


136 


0.00 


7.67 


0.24 


211 


0.01 


0.20 


117 


0.01 7.16 


0.23 




South 


3.0 


36.6 


171 


6.97 0.015 


0.96 


133 


0.00 


6.92 


0.38 


194 


0.03 


0.54 


96.1 


0.23 6.58 


0.13 




South 


3.0 


39.5 


155 


6.55 0.070 


1.04 


129 


0.01 


6.16 


0.70 


165 


0.05 


0.67 


85.1 


0.74 5.85 


0.39 


2 


North 


0.5 


-1.1 


168 


7.24 0.010 


0.00 


170 


0.00 


7.53 


0.57 


518 


0.02 


0.02 


202 


0.02 6.75 


0.38 


2 


North 


0.5 


1.8 


140 


7.17 0.130 


0.00 


173 


0.00 


7.00 


0.24 


283 


0.01 


0.05 


159 


0.04 6.92 


0.08 


2 


North 


0.5 


4.7 


191 


7.61 0.250 


0.00 


181 


0.03 


7.00 


0.03 


167 


0.01 


0.00 


185 


0.01 7.21 


0.15 


2 


North 


0.5 


7.6 


198 


7.55 0.020 


0.02 


207 


0.00 


7.00 


0.03 


198 


0.01 


0.03 


199 


0.00 7.21 


0.10 


2 


North 


0.5 


10.5 


162 


7.71 0.000 


0.00 


200 


0.01 


7.05 


0.10 


216 


0.00 


0.03 


219 


0.05 7.24 


0.11 


2 


North 


0.5 


13.4 


170 


7.76 0.060 


0.00 


164 


0.00 


6.61 


0.07 


221 


0.00 


0.07 


177 


0.00 7.07 


0.16 


2 


North 


0.5 


16.3 


149 


7.82 0.010 


0.00 


156 


0.00 


6.74 


0.05 


226 


0.00 


0.07 


128 


0.00 7.14 


0.11 


2 


North 


0.5 


19.2 


183 


7.87 0.000 


0.03 


186 


0.00 


6.32 


0.05 


226 


0.01 


0.05 


144 


0.00 6.83 


0.15 


2 


North 


0.5 


22.1 


212 


8.23 0.000 


0.00 


172 


0.00 


7.18 


0.07 


189 


0.02 


0.03 


124 


0.00 7.11 


0.07 


2 


North 


0.5 


25.0 


211 


8.20 0.020 


0.07 


153 


0.00 


6.75 


0.13 


200 


0.01 


0.03 


145 


0.00 6.89 


0.07 


2 


North 


0.5 


27.9 


188 


7.86 0.140 


0.00 


146 


0.00 


6.88 


0.07 


196 


0.01 


0.02 


128 


0.01 6.91 


0.15 


2 


North 


0.5 


30.8 


113 


7.47 1.530 


0.00 


169 


0.00 


6.27 


0.13 


242 


0.36 


0.00 


225 


1.50 6.23 


1.04 


2 


North 


0.5 


33.7 


110 


7.39 0.715 


0.00 


84.8 


0.00 


7.05 


0.07 


131 


0.06 


0.00 


102 


0.04 6.81 


0.16 


2 


North 


0.5 


36.6 


123 


6.97 0.350 


0.00 


94.5 


0.48 


6.49 


0.07 


175 


0.73 


0.00 


137 


2.20 6.45 


0.08 


2 


North 


0.5 


39.5 


113 


6.54 0.370 


0.00 


88.5 


1.11 


6.24 


0.02 


104 


1.92 


0.00 


101 


2.55 6.03 


0.08 


2 


North 


3.0 


-1.1 


108 


6.29 0.020 


0.00 


161 


0.06 


6.76 


1.68 


560 


0.07 


0.41 


192 


0.05 6.52 


1.71 


2 


North 


3.0 


1.8 


131 


6.69 0.000 


0.02 


202 


0.02 


7.44 


1.04 


403 


0.01 


0.41 


206 


0.04 6.89 


0.80 


2 


North 


3.0 


4.7 


253 


7.10 0.005 


0.05 


227 


0.01 


7.75 


0.03 


180 


0.01 


0.08 


218 


0.00 7.25 


0.90 


2 


North 


3.0 


7.6 


226 


7.03 0.035 


0.10 


234 


0.02 


7.16 


0.21 


212 


0.04 


0.23 


248 


0.00 7.03 


1.06 


2 


North 


3.0 


10.5 


192 


7.20 0.000 


0.05 


206 


0.04 


7.62 


0.57 


240 


0.09 


0.47 


241 


0.00 6.95 


0.83 


2 


North 


3.0 


13.4 


172 


7.38 0.035 


0.11 


172 


0.02 


7.48 


0.20 


245 


0.00 


0.21 


192 


0.16 7.19 


0.38 


2 


North 


3.0 


16.3 


166 


7.54 0.100 


0.29 


168 


0.00 


7.12 


0.21 


243 


0.02 


0.31 


157 


0.02 7.14 


0.16 


2 


North 


3.0 


19.2 


208 


7.48 0.015 


0.02 


198 


0.00 


6.98 


0.03 


222 


0.02 


0.10 


158 


0.04 7.13 


0.15 


2 


North 


3.0 


22.1 


222 


7.23 0.095 


1.22 


181 


0.86 


6.64 


0.28 


189 


0.23 


0.11 


120 


3.24 6.51 


0.36 


2 


North 


3.0 


25.0 


206 


7.27 0.045 


0.21 


155 


0.10 


7.03 


0.11 


210 


0.25 


0.07 


123 


1.55 6.18 


0.10 


2 


North 


3.0 


27.9 


179 


7.56 0.050 


0.03 


132 


0.02 


7.56 


0.03 


197 


0.05 


0.07 


129 


0.14 6.70 


0.02 


2 


North 


3.0 


30.8 


121 


7.19 0.075 


0.05 


94.1 


0.01 


7.40 


0.00 


179 


0.03 


0.00 


126 


0.11 7.01 


0.02 


2 


North 


3.0 


33.7 


114 


7.06 0.030 


0.02 


86.8 


0.00 


7.11 


0.00 


150 


0.05 


0.00 


103 


0.15 6.93 


0.00 


2 


North 


3.0 


36.6 


129 


6.54 0.025 


0.02 


91.6 


0.02 


7.02 


0.00 


146 


0.04 


0.00 


118 


0.14 6.85 


0.00 


2 


North 


3.0 


39.5 


103 


5.91 2.160 


0.00 


103 


4.38 


6.05 


0.29 


145 


0.89 


0.02 


180 


3.50 6.15 


0.24 



U.S. Geological Survey 



Ashumet Pond Geochemical Barrier - August 2006 



Table 4. Field and laboratory chemical analysis of samples collected from permanent pond-bottom piezometers collected prior to, and 2,11 and 23 months 
after barrier installation. 

[Location of sites shown in figure 2. F shorthand for MA-FSW. Elevations of all permanently installed devices were determined on October 6, 2004 by the U.S. Geological Survey^S/cm, microsiemens per centimeter at 25oC; <, actual 
value less than method detection limit; E, estimated value; — , no data. Dissolved oxygen (less than 2 mg/L) was determined onsite using a colorimetric photometer. Dissolved oxygen greater than 2 mg/L was determined in the laboratory 
using a meter and electrode. Pond stage measured on 8/8/04, 11/3/04, 7/20/05, and 8/9/06 was 43.90, 43.43, 45.38, and 46.15 feet above NGVD of 1929, respectively. All phosphorus and nitrogen samples were analyzed at the USGS 
National Water Quality Laboratory.] 



USGS Site Name 


Bott. of Screen 
Altitude (ft) 


8/4/04 


Altitude of Water Level 

(ft) 

11/3/04 7/20/05 


8/9/06 


8/4/04 


Specific Conductance 

(H,S/cm) 

11/3/04 7/20/05 


8/9/06 


8/4/04 


PH 
(standard units) 
11/3/04 7/20/05 


8/9/06 


8/4/04 


Oxygen, dissolved 

(mg/L) 

11/3/04 7/20/05 


8/9/06 


F633P0 1-0010 


34.02 


44.080 


43.610 


45.515 


46.288 


108 


127 


176 


196 


5.98 


6.03 


6.42 


6.14 


0.130 


8.90 


0.035 


0.005 


F633P01-0030 


14.44 


44.113 


43.620 


45.563 


46.330 


162 


147 


187 


177 


6.75 


6.55 


6.87 


6.28 


0.065 


2.73 


0.005 


0.025 


F633P01-0060 


-15.56 


44.136 


43.633 


45.614 


46.294 


131 


138 


137 


118 


6.94 


6.71 


... 


6.94 


7.38 


9.27 


0.700 


0.655 


F633P01-0100 


-55.56 


44.162 


43.640 


45.663 


... 


65.8 


85.1 


75.3 


76.3 


6.83 


7.14 


... 


8.24 


5.38 


5.54 


8.53 


0.575 


F635P01-0010 


31.65 


44.005 


... 


... 


46.291 


184 


191 


133 


102 


6.67 


6.61 


6.37 


6.17 


0.005 


0.615 


5.67 


0.050 


F635P01-0030 


6.65 


44.054 


43.558 


45.505 


46.284 


104 


176 


107 


95.6 


6.63 


6.29 


6.36 


6.06 


0.010 


0.275 


0.165 


0.135 


F635P01-0060 


-18.50 


44.097 


43.587 


45.553 


46.340 


93.8 


101 


95.1 


98.6 


6.31 


6.39 


6.36 


5.77 


0.025 


0.035 


0.015 


0.045 


F635P01-0100 


-58.60 


44.107 


43.607 


45.569 


46.366 


79.6 


76.5 


71.5 


72.7 


6.38 


6.47 


6.07 


5.50 


0.220 


0.070 


8.41 


8.84 


F636P01-0010 


26.30 


44.035 


43.522 


45.492 


46.278 


109 


111 


116 


107 


6.30 


6.08 


6.04 


5.98 


0.120 


0.700 


0.000 


0.245 


F636P01-0030 


6.30 


44.044 


43.532 


45.515 


46.294 


105 


106 


117 


91.6 


6.55 


6.33 


6.03 


5.43 


0.130 


0.625 


1.12 


8.74 


F636P01-0060 


-23.70 


44.067 


43.548 


45.537 


46.311 


72.3 


77.1 


104 


88.0 


6.21 


6.01 


6.05 


5.82 


9.54 


10.21 


9.29 


9.28 


F636P01-0100 


-63.70 


44.077 


43.545 


45.409 


46.291 


144 


91.3 


114 


102 


6.65 


5.89 


6.00 


5.76 


5.18 


9.32 


7.35 


7.64 



Page 1 of 2 



U.S. Geological Survey 



Ashumet Pond Geochemical Barrier - August 2006 



Table 4. Field and laboratory chemical analysis of samples collected from permanent pond-bottom piezometers 
collected prior to, and 2, 1 1, and 23 months after barrier installation - Continued 









Phosphorus 


, dissolved 






Nitrate, dissolved 






Ammonium. 


, dissolved 






Bott. of Screen 




(mg/L ; 


asP) 






(mg/L 


asN) 






(mg/L i 


asN) 




USGS Site Name 


Altitude (ft) 


8/4/04 


11/3/04 


7/20/05 


8/9/06 


8/4/04 


11/3/04 


7/20/05 


8/9/06 


8/4/04 


11/3/04 


7/20/05 


8/9/06 


F633P0 1-0010 


34.02 


1.94 


1.46 


1.34 


1.08 


1.29 


0.95 


<0.06 


<0.06 


<0.04 


<0.04 


0.19 


0.60 


F633P01-0030 


14.44 


2.25 


2.07 


1.40 


1.32 


0.05 


<0.06 


<0.06 


<0.06 


1.16 


1.16 


1.04 


0.63 


F633P01-0060 


-15.56 


0.49 


<0.02 


E0.02 


0.29 


1.84 


<0.06 


<0.06 


1.39 


2.47 


3.68 


3.51 


0.92 


F633P01-0100 


-55.56 


<0.01 


<0.02 


<0.02 


<0.02 


0.75 


0.49 


<0.06 


<0.06 


<0.04 


0.17 


0.50 


0.41 


F635P01-0010 


31.65 


0.39 


0.48 


0.47 


0.65 


1.67 


0.52 


2.03 


2.13 


2.21 


1.02 


0.12 


1.54 


F635P01-0030 


6.65 


0.34 


0.29 


0.32 


0.17 


2.15 


1.67 


2.17 


2.14 


2.12 


2.74 


2.15 


1.00 


F635P01-0060 


-18.50 


0.03 


0.03 


0.03 


0.03 


2.87 


2.78 


2.40 


2.49 


1.89 


1.74 


1.51 


0.88 


F635P01-0100 


-58.60 


0.43 


0.05 


0.03 


0.03 


2.56 


2.07 


0.91 


0.62 


1.73 


1.70 


0.06 


0.01 


F636P01-0010 


26.30 


<0.01 


<0.02 


<0.02 


E0.012 


2.95 


3.00 


2.62 


2.61 


3.32 


3.10 


2.76 


1.89 


F636P01-0030 


6.30 


0.02 


0.03 


E0.01 


<0.02 


2.74 


2.94 


2.95 


0.86 


2.16 


1.70 


0.50 


0.02 


F636P01-0060 


-23.70 


0.16 


<0.02 


E0.01 


<0.02 


0.65 


0.63 


0.85 


0.70 


<0.04 


0.04 


0.04 


0.01 


F636P01-0100 


-63.70 


<0.01 


<0.02 


E0.02 


<0.02 


0.85 


0.72 


0.66 


0.56 


0.27 


<0.04 


E0.03 


0.01 



Page 2 of 2 



U.S. Geological Survey 



Ashumet Pond Geochemical Barrier - August 2006 



Table 5. Field seepage data and chemical analysis of samples collected 2, 11, and 23 months after barrier installation at permanent seepage 
meters installed the geochemical barrier. 

[Location of sites shown in figure 2. Seepage meters la and lb are located in the control area south of the geochemical barrier area. Paired meters arc approximately 5 feet apart. Meters labeled ' 
are on the southern side of the pair, "b" meters are on the north side. Each meter covers a pond-bottom area of 380 in(2.64 ft 2 ). Field phosphate was determined onsite using a colorimetric 
method, ft, feet; min, minutes; ml, millileters; mg/L, milligrams per literjtS/cm, microsiemens per centimeter at 25"C; L/day, liters per day; mg/d, milligrams per day; — , no analysis. Seepage 
results reported in letter dated 9/26/05 are included] 



Meter Site No. 



Water 
Depth (ft) 



Date Bag/valve No. 



Total Time 
(min) 



Total 

Volume 

(ml) 



Specific 
Conductance 

(uS/cm) 



Field 

Phosphate, 

dissolved (mg/L 

asP) 



Water 

Flux 

(L/day) 



Phosphorus 

Flux 

(mg/d) 



11/2/2004 
11/2/2004 
11/2/2004 



1a 
1a 
1b 



20 
21 
15 



2620 
2550 
2320 



185 
181 



0.42 
0.44 



188.6 
174.9 
227.7 



--. jrageWatei Flux (1a) for 1 12004: 197.1 



80.0 
77.0 



2.8 
2.8 
2.8 
2.8 
2.8 



7/18/2005 
7/22/2005 
7/22/2005 
7/22/2005 
7/22/2005 



11 
11 
21 
11 
21 



7 1150 110 — 236.6 

17 2390 181 — 202.4 

11 1660 177 — 217.3 

11 1505 179 — 197.0 

12 1830 180 0.80 219.6 

Average Water Flux (la) for 7 2005: 214.6 



3.4 
3.4 
3.4 
3.4 
3.4 



8/8/2006 
8/8/2006 
8/8/2006 
8/8/2006 
8/8/2006 



11 
21 
21 
11 
11 



23 
15 
10 
10 
10 



3615 
2640 
1580 
1760 
1570 



157 
142 
136 
143 
136 



1.26 



Average Wat : ■ F i iy ■ la) tor 8 2006: 



226.3 
253.4 
227.5 
253.4 
226.1 
237.4 



0.9 
0.9 
0.9 



11/2/2004 
11/2/2004 
11/2/2004 



15 
16 
1a 



20 
21 
15 



1210 
1045 
1340 



215 
209 



0.55 
0.57 



Average ." atei Flu> lb) r -?: 11 2004: 



87.1 
71.7 
128.6 
95 8 



47.9 
40.9 



2.8 
2.8 
2.8 
2.8 
2.8 



7/1 8/2005 
7/22/2005 
7/22/2005 
7/22/2005 
7/22/2005 



6 
21 
11 
21 
11 



7 

17 
11 
11 
12 



570 
1420 
920 
900 
960 



107 
173 
179 
177 
165 



0.82 



Ave age Watei F ux ■ lb foi 7 2005: 



117.3 
120.3 
120.4 
117.8 
115.2 
1 18.20 



93.9 



3.4 
3.4 
3.4 
3.4 
3.4 



8/8/2006 
8/8/2006 
8/8/2006 
8/8/2006 
8/8/2006 



21 
11 
11 
21 
21 



23 
15 
10 
10 
10 



2150 
1235 
660 
1050 
900 



115 
113 
109 
108 



1.30 



Average- Wate! Flux Mb- foi ■ 3-2006: ; 



134.6 
118.6 
95.0 
151.2 
129.6 
1 2 • 8 



154.7 



Page 1 of 4 



U.S. Geological Survey 



Ashumet Pond Geochemical Barrier - August 2006 



Table 5. Field seepage data and chemical analysis of samples collected two and 1 1 months after barrier installation at permanent seepage 
meters installed the geochemical barrier - Continued 



Meter Site No. 



Water 
Depth (ft) 


Date 





11/2/2004 


1.8 


7/1 8/2005 


1.8 


7/22/2005 


1.8 


7/22/2005 


1.8 


7/22/2005 


1.8 


7/22/2005 


2.4 


8/8/2006 


2.4 


8/8/2006 


2.4 


8/8/2006 


2.4 


8/8/2006 


2.4 


8/8/2006 



Bag/valve No. 



(min) 



Total 


Specific 


Volume 


Conductance 


(ml) 


(uS/cm) 



Field 

Phosphate, 

dissolved (mg/L 

asP) 



Water 

Flux 

(L/day) 



Phosphorus 

Flux 

(mg/d) 



Meter Dry 
Average Water Flux :2b- for 1 1 2004: 



11 
15 
10 
15 
10 

1a 
10 
1a 
10 
1a 



19 
15 
14 
11 
10 

17 
15 
17 
17 
18 



1160 


97.0 


— 


87.9 


940 


190 


... 


90.2 


950 


187 


... 


97.7 


1010 


200 


... 


132.2 


760 


215 


0.07 


109.4 




Average Watei F ux (2a) foi 7 2005: 


103 5 


1160 


167 




98.3 


1140 


171 


... 


109.4 


1190 


161 


... 


100.8 


1250 


166 


... 


105.9 


1120 


157 


0.03 


89.6 




Av ?rage Walei F u> (2a) a 8 2C 36: 


100.8 




Meter Dry 








Average Water Flux (2b) for 1 i '2004: 


11111111 


1380 


190 


... 


110.4 


875 


205 


... 


84.0 


1060 


218 


... 


109.0 


750 


209 


... 


98.2 


815 


259 


0.03 


117.4 




Ave- ago Water Flux (2b) fot 7 2005: 


103 3 


1180 


168 


... 


100.0 


1050 


172 


... 


100.8 


1180 


157 


... 


100.0 


1130 


165 


... 


95.7 


1110 


164 


0.02 


88.8 



7.1 



2b 






11/2/2004 


1.8 


7/1 8/2005 


1.8 


7/22/2005 


1.8 


7/22/2005 


1.8 


7/22/2005 


1.8 


7/22/2005 


2.4 


8/8/2006 


2.4 


8/8/2006 


2.4 


8/8/2006 


2.4 


8/8/2006 


2.4 


8/8/2006 



11 

10 
15 
10 
15 

10 
1a 
10 
1a 
10 



18 
15 
14 
11 
10 

17 
15 
17 
17 
18 



1.5 



Average Water Flux (2b) for 8 8/2006 _97\0_ 



Page 2 of 4 



U.S. Geological Survey 



Ashumet Pond Geochemical Barrier - August 2006 



Table 5. Field seepage data and chemical analysis of samples collected two and 1 1 months after barrier installation at permanent seepage 
meters installed the geochemical barrier - Continued 



Meter Site No. 



Water 
Depth (ft) 



Date 



Bag/valve No. 



(min) 



Total 

Volume 

(ml) 



Specific 
Conductance 

(uS/cm) 



Field 

Phosphate, 

dissolved (mg/L 

asP) 



Water 

Flux 

(L/day) 



Phosphorus 

Flux 

(mg/d) 



3a 



0.5 
0.5 
0.5 
0.5 



11/2/2004 
11/2/2004 
11/2/2004 
11/2/2004 



23 
22 
17 
20 



1625 
1440 
1100 
1420 



214 
224 
223 
224 



0.05 
0.05 
0.07 



Average Watei Flu> (3 i loi 11 2004 



101.7 
94.3 
93.2 
102.2 
97.9 



5.1 
4.7 
6.5 



2.4 
2.4 
2.4 
2.4 
2.4 



7/1 8/2005 
7/22/2005 
7/22/2005 
7/22/2005 
7/22/2005 



36 
3 

36 
3 
36 



11 510 101 — 66.8 

17 1165 163 — 98.7 

13 810 173 — 89.7 

11 760 173 — 99.5 

9 325 172 0.03 52.0 

Average Water Flux (3a) for 7-2005: 81.3 



3.0 
3.0 
3.0 
3.0 



8/8/2006 
8/8/2006 
8/8/2006 
8/8/2006 



1a 



1a 



15 1040 142 0.05 99.8 
15 965 144 — 92.6 
15 940 144 — 90.2 
8 555 119 - 99.9 
Average Water Flux (3a) for 8/8/2006: 95.6 



4.9 



0.5 
0.5 
0.5 
0.5 



2.4 
2.4 
2.4 
2.4 
2.4 

3.0 
3.0 
3.0 
3.0 



11/2/2004 
11/2/2004 
11/2/2004 
11/2/2004 



7/18/2005 
7/22/2005 
7/22/2005 
7/22/2005 
7/22/2005 

8/8/2006 
8/8/2006 
8/8/2006 
8/8/2006 



13 
3 
3 
11 



36 
36 
3 

36 
3 



23 
22 
17 
20 



11 
17 
13 
11 



15 
15 
15 



1905 211 

2725 217 

2170 217 
2420 



220 
1010 
1010 
880 
510 

1160 
630 
1075 
565 



100 
166 
175 
176 
173 
e WaU 

145 
134 
146 
132 



■^ ■•:-.-}■.- -.V; -::-:- Fu- :t- ••■?■ i :::;»;; 



0.27 


119.3 


32.2 


0.33 


178.4 


58.2 


0.21 


183.8 
174.2 


38.6 


ji 11.-2004: 


28.8 
85.6 
111.9 
115.2 


... 


0.05 


81.6 


4.0 


foi 72005: 


WSM 




0.07 


111.4 
60.5 
103.2 

101.7 


7.3 


r 8.8 2006: ; 


WwM^B 





Page 3 of 4 



U.S. Geological Survey 



Ashumet Pond Geochemical Barrier - August 2006 



Table 5. Field seepage data and chemical analysis of samples collected two and 1 1 months after barrier installation at permanent seepage 
meters installed the geochemical barrier - Continued 



Meter Site No. 



Water 
Depth (ft) 



Date 



Bag/valve No. 



(min) 



Total 

Volume 

(ml) 



Specific 
Conductance 

(uS/cm) 



Field 

Phosphate, 

dissolved (mg/L 

asP) 



Water 


Phosphorus 


Flux 


Flux 


(L/day) 


(mg/d) 


67.2 


1.3 


71.3 


0.0 


74.1 


0.0 


71.4 


... 


7\ :■ 




64.0 


... 


63.7 


... 


72.0 


... 


74.1 


... 


36.8 


9.6 


62.1 





4a 



0.95 
0.95 
0.95 
0.95 



11/2/2004 
11/2/2004 
11/2/2004 
11/2/2004 

7/1 8/2005 
7/22/2005 
7/22/2005 
7/22/2005 
7/22/2005 



6 
11 
21 
36 



61 
31 
27 
25 

17 
19 
15 
14 
9 



2845 
1535 
1390 

1240 

755 
840 
750 
720 
230 



161 
161 
162 



0.02 
0.00 
0.00 



Average Mate F ux (4a) foi II 20( 4 

96.3 
95.8 
109 
105 

0.26 
Average Watei Flux (4a) foi 7/2005: 



3.2 
3.2 
3.2 
3.2 



8/8/2006 
8/8/2006 
8/8/2006 
8/8/2006 



15 
17 
22 
20 



765 
825 
1080 
990 



77.7 
76.0 
78.2 
76.9 



0.02 
0.03 
0.02 
0.08 



Aveiage Watc Fiux -:4a- for c/8/2006: 



73.4 
69.9 
70.7 
71.3 
71 3 



1.2 
2.3 
1.2 
5.8 



1.0 
1.0 
1.0 
1.0 



11/2/2004 
11/2/2004 
11/2/2004 
11/2/2004 



4 
21 
11 
21 



22 
20 
10 
25 



915 
810 
475 
1020 



177 
175 



0.00 
0.00 



Average /Vatei Flux 4b) foi : : 2004: 



59.9 
58.3 
68.4 
58.8 
61 3 



0.0 
0.0 



7/18/2005 
7/22/2005 
7/22/2005 
7/22/2005 
7/22/2005 



10 
17 



17 
19 
15 
14 



585 
850 
610 
630 
360 



100 
105 
109 
100 



0.23 



Aveiage Walei F a-. 4b) fo " 2005: 



49.6 
64.4 
58.6 
64.8 
57.6 
59. C 



3.2 
3.2 
3.2 
3.2 



8/8/2006 
8/8/2006 
8/8/2006 
8/8/2006 



15 
17 
22 
20 



595 
635 
800 
765 



93.6 
95.2 
95.9 
95.1 



0.05 
0.10 
0.00 



A . ■- ■ ;-!■:■ -.V ■:■:■ F:i -,^;JS:'_^JJ:'^1-1 



57.1 
53.8 
52.4 

58.3 

55.4 



2.8 
5.3 
0.0 



Page 4 of 4 



U.S. Geological Survey 



st Pond Geochemical Barrier - August 2006 



Table 6. Location and installation data for ground-water samples collected from a temporary drive points below the pond bottom, Ashumet Pond, August 2 - 21 , 2006 

3 projected to North Atlantic Datum 1927 (NAD27) using a Geographical Information System (GIS). 



[State plane coordinates w< 
Altitude is in feet relative to 
Pond stage determined by 



ined using global positioning system from North Atlantic Datum 1983 (NAD83). Coordinat 
al Geodetic Vertical Datum of 1929 (NGVD29). m, meters; ft, feet. Drive-point method: K 
ent of USGS pond siphon gage located near the Fishermans Cove boat ramp. 



USGS Station Name USGS Site ID 



USGS Location 



Drive Depth (ft) Date Sampled 



NAD83 


NAD83 


NAD27 


NAD27 


Easting 


Northing 


Easting 


Northing 


(ft) 


(m) 


(ft) 


(ft) 



„■ . , n j e. u, u, . r> .lb' n ■ . o ■ lt Alt. Top of Drive- Alt. Bott. of Drive- 

Distance from Pond Stage (ft Water Depth Drive-Point Screen Length _ . , Z .„ _ . , _ 

ou™«« -u u «rmim «« ..-.u--4 ,„x Point Screen (ft Point Screen (ft 



Shore (ft) above NGVD29) 



above NGVD29) above NGVD29) 



MA-FSW 669-A01 

MA-FSW 669-A01 

MA-FSW 669-A02 

MA-FSW 669-A02 

MA-FSW 669-A03 

MA-FSW 669-A03 

MA-FSW 669-A04 

MA-FSW 669-A04 

MA-FSW 669-A05 

MA-FSW 669-A05 

MA-FSW 669-A06 

MA-FSW 669-A06 

MA-FSW 669-A07 

MA-FSW 669-A07 

MA-FSW 669-A08 

MA-FSW 669-A08 

MA-FSW 669-A08 

MA-FSW 669-A09 

MA-FSW 669-A09 

MA-FSW 669-A10 

MA-FSW 669-A10 

MA-FSW 669-A11 

MA-FSW 669-A11 

MA-FSW 669-A12 

MA-FSW 669-A12 

MA-FSW 669-A13 

MA-FSW 669-A13 

MA-FSW 669-A14 

MA-FSW 669-A14 

MA-FSW 669-A14 

MA-FSW 669-A15 

MA-FSW 669-A15 

MA-FSW 669-A15 

MA-FSW 669-A16 

MA-FSW 669-A16 

MA-FSW 669-A16 

MA-FSW 669-A17 

MA-FSW 669-A17 

MA-FSW 669-A17 

MA-FSW 669-A18 

MA-FSW 669-A18 

MA-FSW 669-A18 

MA-FSW 669-A19 

MA-FSW 669-A19 

MA-FSW 669-A20 

MA-FSW 669-A20 

MA-FSW 669-A21 

MA-FSW 669-A21 

MA-FSW 669-A21 

MA-FSW 669-A22 

MA-FSW 669-A22 

MA-FSW 669-A22 

MA-FSW 669-A23 

MA-FSW 669-A23 

MA-FSW 669-A23 

MA-FSW 669-A24 

MA-FSW 669-A24 

MA-FSW 669-A24 

MA-FSW 669-A25 

MA-FSW 669-A25 

MA-FSW 669-A25 

MA-FSW 669-A26 

MA-FSW 669-A26 

MA-FSW 669-A27 

MA-FSW 669-A27 

MA-FSW 669-A27 

MA-FSW 669-A28 

MA-FSW 669-A28 

MA-FSW 669-A28 

MA-FSW 669-A29 

MA-FSW 669-A29 

MA-FSW 669-A29 

MA-FSW 669-A30 

MA-FSW 669-A30 

MA-FSW 669-A30 

MA-FSW 669-A31 

MA-FSW 669-A31 

MA-FSW 669-A31 

MA-FSW 669-A32 

MA-FSW 669-A32 

MA-FSW 669-A33 

MA-FSW 669-A33 

MA-FSW 669-A34 

MA-FSW 669-A34 

MA-FSW 669-A34 

MA-FSW 669-A35 

MA-FSW 669-A35 

MA-FSW 669-A35 

MA-FSW 669-A36 



413804070322501 


01-20 


0.50 


8/2/2006 


279960.096 


820930.300 


862199.335 


232665.936 


413804070322501 


01-20 


3.00 


8/2/2006 


279960.096 


820930.300 


862199.335 


232665.936 


413805070322411 


02-20 


0.50 


8/3/2006 


279981 .284 


820949.857 


862268.851 


232730.098 


413805070322411 


02-20 


3.00 


8/3/2006 


279981 .284 


820949.857 


862268.851 


232730.098 


413804070322401 


02-90 


0.50 


8/3/2006 


279979.536 


820929.851 


862263.115 


232664.461 


413804070322401 


02-90 


3.00 


8/3/2006 


279979.536 


820929.851 


862263.115 


232664.461 


413805070322314 


03-20 


0.50 


8/3/2006 


279999.319 


820945.576 


862328.021 


232716.051 


413805070322314 


03-20 


3.00 


8/3/2006 


279999.319 


820945.576 


862328.021 


232716.051 


413804070322301 


03-90 


0.50 


8/3/2006 


280000.451 


820926.413 


862331 .734 


232653.180 


413804070322301 


03-90 


3.00 


8/3/2006 


280000.451 


820926.413 


862331 .734 


232653.180 


413805070322215 


04-00 


0.50 


8/3/2006 


280025.862 


820961 .658 


862415.105 


232768.812 


413805070322215 


04-00 


3.00 


8/3/2006 


280025.862 


820961 .658 


862415.105 


232768.812 


413805070322220 


04-08 


0.50 


8/4/2006 


280026.695 


820960.285 


862417.838 


232764.307 


413805070322220 


04-08 


3.00 


8/4/2006 


280026.695 


820960.285 


862417.838 


232764.307 


413805070322216 


04-16 


0.50 


8/4/2006 


280028.180 


820957.821 


862422.710 


232756.223 


413805070322216 


04-16 


1.50 


8/4/2006 


280028.180 


820957.821 


862422.710 


232756.223 


413805070322216 


04-16 


3.00 


8/4/2006 


280028.180 


820957.821 


862422.710 


232756.223 


413805070322221 


04-24 


0.50 


8/7/2006 


280029.312 


820955.941 


862426.424 


232750.055 


413805070322221 


04-24 


3.00 


8/7/2006 


280029.312 


820955.941 


862426.424 


232750.055 


413805070322217 


04-35 


0.50 


8/7/2006 


280031.140 


820953.702 


862432.421 


232742.709 


413805070322217 


04-35 


3.00 


8/7/2006 


280031.140 


820953.702 


862432.421 


232742.709 


413806070322211 


05-08 


0.50 


8/7/2006 


280033.000 


820964.929 


862438.524 


232779.543 


413806070322211 


05-08 


3.00 


8/7/2006 


280033.000 


820964.929 


862438.524 


232779.543 


413805070322218 


05-24 


0.50 


8/7/2006 


280037.378 


820963.084 


862452.887 


232773.490 


413805070322218 


05-24 


3.00 


8/7/2006 


280037.378 


820963.084 


862452.887 


232773.490 


413805070322219 


05-46 


0.50 


8/7/2006 


280041 .267 


820957.395 


862465.646 


232754.825 


413805070322219 


05-46 


3.00 


8/7/2006 


280041 .267 


820957.395 


862465.646 


232754.825 


413806070322212 


06-00 


0.50 


8/7/2006 


280040.500 


820973.500 


862463.130 


232807.663 


413806070322212 


06-00 


1.50 


8/7/2006 


280040.500 


820973.500 


862463.130 


232807.663 


413806070322212 


06-00 


3.00 


8/7/2006 


280040.500 


820973.500 


862463.130 


232807.663 


413806070322213 


06-08 


0.50 


8/10/2006 


280042.099 


820971 .659 


862468.376 


232801.622 


413806070322213 


06-08 


1.50 


8/10/2006 


280042.099 


820971 .659 


862468.376 


232801 .622 


413806070322213 


06-08 


3.00 


8/10/2006 


280042.099 


820971 .659 


862468.376 


232801.622 


413806070322214 


06-16 


0.50 


8/10/2006 


280043.900 


820968.789 


862474.285 


232792.206 


413806070322214 


06-16 


1.50 


8/10/2006 


280043.900 


820968.789 


862474.285 


232792.206 


413806070322214 


06-16 


3.00 


8/10/2006 


280043.900 


820968.789 


862474.285 


232792.206 


413806070322215 


06-24 


0.50 


8/10/2006 


280045.357 


820967.445 


862479.065 


232787.797 


413806070322215 


06-24 


1.50 


8/10/2006 


280045.357 


820967.445 


862479.065 


232787.797 


413806070322215 


06-24 


3.00 


8/10/2006 


280045.357 


820967.445 


862479.065 


232787.797 


413806070322101 


06-35 


0.50 


8/14/2006 


280047.581 


820964.160 


862486.362 


232777.019 


413806070322101 


06-35 


1.50 


8/14/2006 


280047.581 


820964.160 


862486.362 


232777.019 


413806070322101 


06-35 


3.00 


8/14/2006 


280047.581 


820964.160 


862486.362 


232777.019 


413805070322101 


06-46 


0.50 


8/14/2006 


280049.695 


820962.915 


862493.298 


232772.934 


413805070322101 


06-46 


3.00 


8/14/2006 


280049.695 


820962.915 


862493.298 


232772.934 


413805070322102 


06-57 


0.50 


8/14/2006 


280051 .893 


820960.384 


862500.509 


232764.630 


413805070322102 


06-57 


3.00 


8/14/2006 


280051 .893 


820960.384 


862500.509 


232764.630 


413806070322216 


07-00 


0.50 


8/10/2006 


280046.205 


820979.522 


862481 .848 


232827.419 


413806070322216 


07-00 


1.50 


8/10/2006 


280046.205 


820979.522 


862481.848 


232827.419 


413806070322216 


07-00 


3.00 


8/10/2006 


280046.205 


820979.522 


862481.848 


232827.419 


413806070322102 


07-08 


0.50 


8/10/2006 


280046.809 


820978.469 


862483.829 


232823.965 


413806070322102 


07-08 


1.50 


8/10/2006 


280046.809 


820978.469 


862483.829 


232823.965 


413806070322102 


07-08 


3.00 


8/10/2006 


280046.809 


820978.469 


862483.829 


232823.965 


413806070322103 


07-16 


0.50 


8/10/2006 


280048.748 


820976.482 


862490.191 


23281 7.446 


413806070322103 


07-16 


1.50 


8/10/2006 


280048.748 


820976.482 


862490.191 


23281 7.446 


413806070322103 


07-16 


3.00 


8/10/2006 


280048.748 


820976.482 


862490.191 


23281 7.446 


413806070322104 


07-24 


0.50 


8/1 0/2006 


280051.291 


820974.812 


862498.534 


232811.966 


413806070322104 


07-24 


1.50 


8/10/2006 


280051.291 


820974.812 


862498.534 


232811.966 


413806070322104 


07-24 


3.00 


8/1 0/2006 


280051.291 


820974.812 


862498.534 


232811.966 


413806070322105 


07-35 


0.50 


8/14/2006 


280053.791 


820971 .829 


862506.736 


232802.179 


413806070322105 


07-35 


1.50 


8/14/2006 


280053.791 


820971 .829 


862506.736 


232802.179 


413806070322105 


07-35 


3.00 


8/14/2006 


280053.791 


820971 .829 


862506.736 


232802.179 


413806070322106 


07-46 


0.50 


8/14/2006 


280056.019 


820969.324 


862514.046 


232793.961 


413806070322106 


07-46 


3.00 


8/14/2006 


280056.019 


820969.324 


862514.046 


232793.961 


413806070322107 


08-00 


0.50 


8/11/2006 


280052.391 


820984.732 


862502.143 


232844.512 


413806070322107 


08-00 


1.50 


8/11/2006 


280052.391 


820984.732 


862502.143 


232844.512 


413806070322107 


08-00 


3.00 


8/11/2006 


280052.391 


820984.732 


862502.143 


232844.512 


413806070322108 


08-08 


0.50 


8/11/2006 


280054.354 


820982.883 


862508.584 


232838.446 


413806070322108 


08-08 


1.50 


8/11/2006 


280054.354 


820982.883 


862508.584 


232838.446 


413806070322108 


08-08 


3.00 


8/11/2006 


280054.354 


820982.883 


862508.584 


232838.446 


413806070322109 


08-16 


0.50 


8/11/2006 


280055.922 


820981 .954 


862513.728 


232835.398 


413806070322109 


08-16 


1.50 


8/11/2006 


280055.922 


820981 .954 


862513.728 


232835.398 


413806070322109 


08-16 


3.00 


8/11/2006 


280055.922 


820981 .954 


862513.728 


232835.398 


413806070322110 


08-24 


0.50 


8/11/2006 


280057.803 


820981 .020 


862519.899 


232832.333 


413806070322110 


08-24 


1.50 


8/11/2006 


280057.803 


820981 .020 


862519.899 


232832.333 


413806070322110 


08-24 


3.00 


8/11/2006 


280057.803 


820981.020 


862519.899 


232832.333 


413806070322111 


08-35 


0.50 


8/14/2006 


280060.379 


820978.509 


862528.351 


232824.095 


413806070322111 


08-35 


1.50 


8/14/2006 


280060.379 


820978.509 


862528.351 


232824.095 


413806070322111 


08-35 


3.00 


8/14/2006 


280060.379 


820978.509 


862528.351 


232824.095 


413806070322112 


08-46 


0.50 


8/14/2006 


280062.636 


820976.029 


862535.755 


232815.958 


413806070322112 


08-46 


3.00 


8/14/2006 


280062.636 


820976.029 


862535.755 


232815.958 


413806070322119 


08-57 


0.50 


8/14/2006 


280064.892 


820973.549 


862543.157 


232807.822 


413806070322119 


08-57 


3.00 


8/14/2006 


280064.892 


820973.549 


862543.157 


232807.822 


413806070322113 


09-00 


0.50 


8/14/2006 


280059.618 


820991.891 


862525.854 


232867.999 


413806070322113 


09-00 


1.50 


8/14/2006 


280059.618 


820991.891 


862525.854 


232867.999 


413806070322113 


09-00 


3.00 


8/14/2006 


280059.618 


820991.891 


862525.854 


232867.999 


413806070322114 


09-08 


0.50 


8/15/2006 


280061.823 


820990.924 


862533.088 


232864.827 


413806070322114 


09-08 


1.50 


8/15/2006 


280061.823 


820990.924 


862533.088 


232864.827 


413806070322114 


09-08 


3.00 


8/15/2006 


280061.823 


820990.924 


862533.088 


232864.827 


413806070322115 


09-16 


0.50 


8/15/2006 


280063.995 


820990.307 


862540.214 


232862.802 



3.25 
3.25 



3.34 
3.34 



46.15 


3.64 


46.15 


3.64 


46.15 


3.64 


46.08 


3.80 


46.08 


3.80 


46.08 


4.40 


46.08 


4.40 


46.08 


2.50 


46.08 


2.50 


46.08 


4.10 


46.08 


4.10 


46.08 


4.76 


46.08 


4.76 


46.08 


1.90 


46.08 


1.90 


46.08 


1.90 


46.02 


2.45 


46.02 


2.45 


46.02 


2.45 


46.02 


2.88 


46.02 


2.88 


46.02 


2.88 


46.02 


3.17 


46.02 


3.17 


46.02 


3.17 


46.09 


4.04 


46.09 


4.04 


46.09 


4.04 


46.09 


5.20 


46.09 


5.20 


46.09 


5.84 


46.09 


5.84 


46.02 


1.38 


46.02 


1.38 


46.02 


1.38 


46.02 


2.18 


46.02 


2.18 


46.02 


2.18 


46.02 


2.79 


46.02 


2.79 


46.02 


2.79 


46.02 


3.24 


46.02 


3.24 


46.02 


3.24 


46.09 


4.10 


46.09 


4.10 


46.09 


4.10 


46.09 


5.09 


46.09 


5.09 


46.02 


2.00 


46.02 


2.00 


46.02 


2.00 


46.02 


2.60 


46.02 


2.60 


46.02 


2.60 


46.02 


3.39 


46.02 


3.39 


46.02 


3.39 


46.02 


3.76 


46.02 


3.76 


46.02 


3.76 


46.09 


4.20 


46.09 


4.20 


46.09 


4.20 


46.09 


5.80 


46.09 


5.80 


46.09 


6.00 


46.09 


6.00 


46.09 


1.96 


46.09 


1.96 


46.09 


1.96 


46.10 


2.80 


46.10 


2.80 


46.10 


2.80 


46.10 


3.30 



42.53 


42.40 


40.30 


39.90 


41.97 


41.84 


39.74 


39.34 


40.97 


40.84 


38.74 


38.34 


42.44 


42.31 


40.21 


39.81 


40.38 


40.25 


38.15 


37.75 


43.68 


43.55 


41.45 


41.05 


43.09 


42.96 


40.86 


40.46 


42.14 


42.01 


41.41 


41.01 


39.91 


39.51 


41.91 


41.78 


39.68 


39.28 


41.31 


41.18 


39.08 


38.68 


43.21 


43.08 


40.98 


40.58 


41.61 


41.48 


39.38 


38.98 


40.95 


40.82 


38.72 


38.32 



41.58 


41.18 


43.20 


43.07 


42.47 


42.07 


40.97 


40.57 


42.77 


42.64 


42.04 


41.64 


40.54 


40.14 


42.48 


42.35 


41.75 


41.35 


40.25 


39.85 


41.68 


41.55 


40.95 


40.55 


39.45 


39.05 


40.52 


40.39 


38.29 


37.89 


39.88 


39.75 


37.65 


37.25 


44.27 


44.14 


43.54 


43.14 


42.04 


41.64 


43.47 


43.34 


42.74 


42.34 


41.24 


40.84 


42.86 


42.73 


42.13 


41.73 


40.63 


40.23 


42.41 


42.28 


41.68 


41.28 



40.63 


40.50 


38.40 


38.00 


43.65 


43.52 


42.92 


42.52 


41.42 


41.02 


43.05 


42.92 


42.32 


41.92 


40.82 


40.42 


42.26 


42.13 


41.53 


41.13 


40.03 


39.63 


41.89 


41.76 


41.16 


40.76 


39.66 


39.26 


41.52 


41.39 


40.79 


40.39 


39.29 


38.89 


39.92 


39.79 


37.69 


37.29 


39.72 


39.59 


37.49 


37.09 


43.76 


43.63 


43.03 


42.63 



42.20 


41.80 


40.70 


40.30 


42.43 


42.30 



U.S. Geological Survey 



st Pond Geochemical Barrier - August 2006 



USGS Station Name 



USGS Location 



Drive Depth (ft) Date Sampled 



Distance from Pond Stage (ft Water Depth Drive-Point Screen Length 
Shore (ft) above NGVD29) (ft) Method (ft) 



Alt. Top of Drive- Alt. Bott. of Drive- 
Point Screen (ft Point Screen (ft 
above NGVD29) above NGVD29) 



FSW 669-A36 


413806070322115 


FSW 669-A36 


413806070322115 


FSW 669-A37 


413806070322116 


FSW 669-A37 


413806070322116 


FSW 669-A37 


413806070322116 


FSW 669-A38 


413806070322117 


FSW 669-A38 


413806070322117 


FSW 669-A38 


413806070322117 


FSW 669-A39 


413806070322118 


FSW 669-A39 


413806070322118 


FSW 669-A40 


413807070322101 


FSW 669-A40 


413807070322101 


FSW 669-A40 


413807070322101 


FSW 669-A41 


413807070322102 


FSW 669-A41 


413807070322102 


FSW 669-A41 


413807070322102 


FSW 669-A42 


413807070322103 


FSW 669-A42 


413807070322103 


FSW 669-A42 


413807070322103 


FSW 669-A43 


413806070322001 


FSW 669-A43 


413806070322001 


FSW 669-A43 


413806070322001 


FSW 669-A44 


413806070322002 


FSW 669-A44 


413806070322002 


FSW 669-A44 


413806070322002 


FSW 669-A45 


413806070322003 


FSW 669-A45 


413806070322003 


FSW 669-A46 


413806070322004 


FSW 669-A46 


413806070322004 


FSW 669-A46 


413806070322004 


FSW 669-A47 


413807070322104 


FSW 669-A47 


413807070322104 


FSW 669-A47 


413807070322104 


FSW 669-A48 


413807070322001 


FSW 669-A48 


413807070322001 


FSW 669-A48 


413807070322001 


FSW 669-A49 


413807070322002 


FSW 669-A49 


413807070322002 


FSW 669-A49 


413807070322002 


FSW 669-A50 


413807070322003 


FSW 669-A50 


413807070322003 


FSW 669-A50 


413807070322003 


FSW 669-A51 


413807070322004 


FSW 669-A51 


413807070322004 


FSW 669-A51 


413807070322004 


FSW 669-A52 


413807070322005 


FSW 669-A52 


413807070322005 


FSW 669-A53 


413807070322020 


FSW 669-A53 


413807070322020 


FSW 669-A54 


413807070322006 


FSW 669-A54 


413807070322006 


FSW 669-A54 


413807070322006 


FSW 669-A55 


413807070322007 


FSW 669-A55 


413807070322007 


FSW 669-A55 


413807070322007 


FSW 669-A56 


413807070322008 


FSW 669-A56 


413807070322008 


FSW 669-A56 


413807070322008 


FSW 669-A57 


413807070322009 


FSW 669-A57 


413807070322009 


FSW 669-A57 


413807070322009 


FSW 669-A58 


413807070322010 


FSW 669-A58 


413807070322010 


FSW 669-A58 


413807070322010 


FSW 669-A59 


413807070322011 


FSW 669-A59 


413807070322011 


FSW 669-A60 


413807070322012 


FSW 669-A60 


413807070322012 


FSW 669-A61 


413807070322013 


FSW 669-A61 


413807070322013 


FSW 669-A61 


413807070322013 


FSW 669-A62 


413807070322014 


FSW 669-A62 


413807070322014 


FSW 669-A62 


413807070322014 


FSW 669-A63 


413807070322015 


FSW 669-A63 


413807070322015 


FSW 669-A63 


413807070322015 


FSW 669-A64 


413807070322016 


FSW 669-A64 


413807070322016 


FSW 669-A64 


413807070322016 


FSW 669-A65 


413807070322017 


FSW 669-A65 


413807070322017 


FSW 669-A65 


413807070322017 


FSW 669-A66 


413807070322018 


FSW 669-A66 


413807070322018 


FSW 669-A67 


413808070322001 


FSW 669-A67 


413808070322001 


FSW 669-A67 


413808070322001 


FSW 669-A68 


413808070322002 


FSW 669-A68 


413808070322002 


FSW 669-A68 


413808070322002 


FSW 669-A69 


413808070322003 


FSW 669-A69 


413808070322003 



10-00 
10-00 
10-00 
10-08 
10-08 
10-08 



10-24 
10-24 
10-24 
10-35 
10-35 
10-35 
10-46 
10-46 
10-57 
10-57 
10-57 



12-00 
12-00 
12-00 



12-24 
12-24 
12-24 
12-35 
12-35 
12-35 
12-46 
12-46 
12-57 
12-57 
13-00 
13-00 
13-00 
13-10 
13-10 
13-10 
13-16 
13-16 
13-16 
13-24 
13-24 
13-24 
13-35 
13-35 
13-35 
13-46 
13-46 



3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 
3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 
3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 
3.00 
0.50 
3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 
3.00 
0.50 
3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 
3.00 
0.50 
1.50 
3.00 
0.50 
1.50 
3.00 
0.50 



5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
5/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
6/2006 
7/2006 
7/2006 
7/2006 
7/2006 
7/2006 
7/2006 
7/2006 
7/2006 
7/2006 
7/2006 
7/2006 
7/2006 
7/2006 
7/2006 
7/2006 
7/2006 
7/2006 
7/2006 
7/2006 
7/2006 
7/2006 
7/2006 
8/2006 
8/2006 
8/2006 
8/2006 
8/2006 
8/2006 
8/2006 
8/2006 
8/2006 
8/2006 
8/2006 
8/2006 
8/2006 
8/2006 
8/2006 
8/2006 
8/2006 
8/2006 
8/2006 
8/2006 
'21/2006 
'21/2006 



280064.307 
280067.999 
280067.999 
280067.999 
280071.542 
280071.542 
280062.453 



280069.058 
280071.391 
280071.391 
280071.391 
280074.462 
280074.462 
280077.278 
280077.278 
280077.278 



280070.014 
280070.014 
280070.014 
280072.216 
280072.216 
280072.216 
280074.122 
280074.122 
280074.122 
280076.609 
280076.609 
280076.609 



280082.478 
280073.317 
280073.317 
280073.317 
280075.350 
280075.350 
280075.350 
280077.139 
280077.139 
280077.139 
280079.048 
280079.048 
280079.048 
280081.681 



280085.037 
280085.037 
280087.353 
280087.353 
280076.879 
280076.879 
280076.879 
280078.899 
280078.899 
280078.899 



280083.03" 
280083.03" 



280086.094 
280089.082 



280085.939 
280085.939 



820985.353 
820985.353 
820985.353 



820997.533 
820997.533 
820997.533 



821007.407 
821007.407 
821007.407 
821006.467 
821006.467 
821006.467 
821004.448 
821004.448 
821004.448 
821003.069 
821003.069 
821003.069 
821001.064 
821001.064 
821001.064 



2.271 
2.271 
2.271 
0.863 
0.863 
0.863 
009.148 



007.391 
007.391 
004.951 
004.951 
022.458 
022.458 



022.41 



8.970 
8.970 



6.757 
6.913 



862609.251 
862609.251 



862595.813 
862595.813 
862595.813 



232949.579 
232949.579 
232949.579 
232950.090 
232950.090 



232991.846 
232991.846 
232991.846 
232986.764 



5.35 
5.35 
1.85 
1.85 
1.85 
2.34 
2.34 
2.34 



3.65 
3.65 
3.65 



6.03 
6.03 
6.03 
1.57 
1.57 
1.57 



!6.764 



46.10 


3.68 


46.10 


3.68 


46.10 


3.68 


46.10 


3.89 


46.10 


3.89 


46.10 


3.89 


46.10 


5.05 


46.10 


5.05 


46.10 


5.80 


46.10 


5.80 


46.04 


1.55 


46.04 


1.55 


46.04 


1.55 


46.04 


2.55 


46.04 


2.55 


46.04 


2.55 


46.04 


3.13 


46.04 


3.13 


46.04 


3.13 


46.04 


3.55 


46.04 


3.55 


46.04 


3.55 


46.04 


3.90 


46.04 


3.90 


46.04 


3.90 


46.04 


5.00 


46.04 


5.00 


46.04 


5.90 


46.04 


5.90 


46.04 


1.30 


46.04 


1.30 


46.04 


1.30 


46.04 


2.60 


46.04 


2.60 


46.04 


2.60 


46.04 


3.30 


46.04 


3.30 


46.04 


3.30 


46.04 


3.65 


46.04 


3.65 


46.04 


3.65 


46.04 


4.00 


46.04 


4.00 


46.04 


4.00 


46.04 


4.80 


46.04 


4.80 


46.04 


1.30 


46.04 


1.30 


46.04 


1.30 


46.04 


2.60 


46.04 


2.60 


46.04 


2.60 


46.04 


3.30 


46.04 


3.30 



40.20 


39.80 


42.13 


42.00 


41.40 


41.00 


39.90 


39.50 


41.63 


41.50 


40.90 


40.50 


39.40 


39.00 


40.38 


40.25 


38.15 


37.75 


43.88 


43.75 


43.15 


42.75 


41.65 


41.25 


43.39 


43.26 


42.66 


42.26 


41.16 


40.76 


42.59 


42.46 


41.86 


41.46 


40.36 


39.96 


42.08 


41.95 


41.35 


40.95 


39.85 


39.45 


41.23 


41.10 


40.50 


40.10 


39.00 


38.60 


40.43 


40.30 


38.20 


37.80 


39.70 


39.57 


38.97 


38.57 


37.47 


37.07 


44.16 


44.03 


43.43 


43.03 


41.93 


41.53 


43.23 


43.10 


42.50 


42.10 


41.00 


40.60 


42.57 


42.44 


41.84 


41.44 


40.34 


39.94 


42.05 


41.92 


41.32 


40.92 


39.82 


39.42 


41.84 


41.71 


41.11 


40.71 


39.61 


39.21 


40.68 


40.55 


38.45 


38.05 


39.93 


39.80 


37.70 


37.30 


44.12 


43.99 


43.39 


42.99 



42.54 


42.41 


41.81 


41.41 


40.31 


39.91 


42.12 


41.99 



41.77 


41.64 


41.04 


40.64 


39.54 


39.14 


40.67 


40.54 


38.44 


38.04 


39.77 


39.64 


37.54 


37.14 


44.37 


44.24 


43.64 


43.24 


42.14 


41.74 


43.07 


42.94 


42.34 


41.94 


40.84 


40.44 


42.37 


42.24 


41.64 


41.24 



39.79 


39.39 


41.67 


41.54 


40.94 


40.54 


39.44 


39.04 


40.87 


40.74 


38.64 


38.24 


44.37 


44.24 


43.64 


43.24 


42.14 


41.74 


43.07 


42.94 


42.34 


41.94 


40.84 


40.44 


42.37 


42.24 


41.64 


41.24 



U.S. Geological Survey 



st Pond Geochemical Barrier - August 2006 



USGS Station Name 



USGS Location 



Drive Depth (ft) Date Sampled 



Distance from Pond Stage (ft Water Depth Drive-Point Screen Length 
Shore (ft) above NGVD29) (ft) Method (ft) 



Alt. Top of Drive- Alt. Bott. of Drive- 
Point Screen (ft Point Screen (ft 
above NGVD29) above NGVD29) 



FSW 669-A69 


413808070322003 


14-16 


3.00 


8/21/2006 


280085 


939 


821028.091 


862612.210 


232986.764 


FSW 669-A70 


413808070322004 


14-24 


0.50 


8/21/2006 


280087 


588 


821028.380 


862617.621 


232987.712 


FSW 669-A70 


413808070322004 


14-24 


1.50 


8/21/2006 


280087 


588 


821028.380 


862617.621 


232987.712 


FSW 669-A70 


413808070322004 


14-24 


3.00 


8/21/2006 


280087 


588 


821028.380 


862617.621 


232987.712 


FSW 669-A71 


413807070322019 


14-35 


0.50 


8/21/2006 


280090 


195 


821025.944 


862626.174 


232979.720 


FSW 669-A71 


413807070322019 


14-35 


1.50 


8/21/2006 


280090 


195 


821025.944 


862626.174 


232979.720 


FSW 669-A71 


413807070322019 


14-35 


3.00 


8/21/2006 


280090 


195 


821025.944 


862626.174 


232979.720 


FSW 669-A72 


413807070321901 


14-46 


0.50 


8/21/2006 


280093 


475 


821024.636 


862636.935 


232975.428 


FSW 669-A72 


413807070321901 


14-46 


1.50 


8/21/2006 


280093 


475 


821024.636 


862636.935 


232975.428 


FSW 669-A72 


413807070321901 


14-46 


3.00 


8/21/2006 


280093 


475 


821024.636 


862636.935 


232975.428 


FSW 669-A73 


413807070321902 


14-57 


0.50 


8/21/2006 


280098 


067 


821022.283 


862652.000 


232967.708 


FSW 669-A73 


413807070321902 


14-57 


3.00 


8/21/2006 


280098.067 


821022.283 


862652.000 


232967.708 


FSW 669-A74 


413808070322005 


15-00 


0.50 


8/21/2006 


280085.037 


821038.745 


862609.251 


233021.718 


FSW 669-A74 


413808070322005 


15-00 


3.00 


8/21/2006 


280085.037 


821038.745 


862609.251 


233021.718 


FSW 669-A75 


413808070322006 


15-16 


0.50 


8/21/2006 


280089 


772 


821036.148 


862624.786 


233013.198 


FSW 669-A75 


413808070322006 


15-16 


3.00 


8/21/2006 


280089 


772 


821036.148 


862624.786 


233013.198 


FSW 669-A76 


413808070321901 


15-35 


0.50 


8/21/2006 


280094 


167 


821034.015 


862639.205 


233006.199 


FSW 669-A76 


413808070321901 


15-35 


3.00 


8/21/2006 


280094 


167 


821034.015 


862639.205 


233006.199 



46.04 
46.04 
46.04 
46.04 
46.04 
46.04 
46.04 
46.04 
46.04 
46.04 
46.03 
46.03 
46.03 
46.03 
46.03 
46.03 
46.03 
46.03 



41.77 


41.64 


41.04 


40.64 


39.54 


39.14 


41.67 


41.54 


40.94 


40.54 


39.44 


39.04 


41.07 


40.94 


40.34 


39.94 


38.84 


38.44 


39.76 


39.63 


37.53 


37.13 


43.96 


43.83 


41.73 


41.33 


42.46 


42.33 


40.23 


39.83 



Additional Push Points Near the Shoreline - Field Measurements Only 



04-(-04) 

04-(-08) 

04-(-12) 

05-(-04) 

05-(-08) 

05-(-12) 

06-(-04) 

06-(-08) 

06-(-12) 

07-(-04) 

■(-08) 

-(-12) 

■(-04) 

■(-08) 

■(-12) 

-(-04) 

■(-08) 

■(-12) 

■(-04) 

-(-08) 

■(-12) 

-(-04) 

■(-08) 

■(-12) 

■(-04) 

■(-08) 

■(-12) 

■(-04) 



13- 



13-(-12) 

14-(-04) 
14-(-08) 
14-(-12) 
15-(-04) 
15-(-08) 
15-(-12) 



0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 
0.50 



8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 
8/28/06 



280045.323 
280055.197 
280052.583 
280050.044 
280059.547 
280057.621 
280055.139 
280065.212 



280070.379 
280067.950 
280065.683 
280071.866 
280071.188 
280067.028 

280076.962 
280075.789 

280078.977 
280076.478 
280082.796 
280081 .629 
280078.752 




232941 .660 
232965.616 
232970.656 
232967.555 
232980.012 
232981.853 
232986.289 
233011.951 
23301 7.224 
233022.542 



46.03 


1.37 


MHE 


0.13 


44.30 


44.17 


46.03 


0.91 


MHE 


0.13 


44.75 


44.62 


46.03 


0.46 


MHE 


0.13 


45.21 


45.08 


46.03 


1.08 


MHE 


0.13 


44.58 


44.45 


46.03 


0.65 


MHE 


0.13 


45.01 


44.88 


46.03 


0.00 


MHE 


0.13 


45.66 


45.53 


46.03 


0.99 


MHE 


0.13 


44.67 


44.54 


46.03 


0.63 


MHE 


0.13 


45.03 


44.90 


46.03 


0.27 


MHE 


0.13 


45.39 


45.26 


46.03 


0.65 


MHE 


0.13 


45.01 


44.88 


46.03 


0.28 


MHE 


0.13 


45.38 


45.25 


46.03 


0.00 


MHE 


0.13 


45.66 


45.53 


46.03 


0.99 


MHE 


0.13 


44.67 


44.54 


46.03 


0.66 


MHE 


0.13 


45.00 


44.87 


46.03 


0.33 


MHE 


0.13 


45.33 


45.20 


46.03 


1.23 


MHE 


0.13 


44.43 


44.30 


46.03 


0.91 


MHE 


0.13 


44.76 


44.63 


46.03 


0.58 


MHE 


0.13 


45.08 


44.95 


46.03 


0.85 


MHE 


0.13 


44.81 


44.68 


46.03 


0.51 


MHE 


0.13 


45.15 


45.02 


46.03 


0.17 


MHE 


0.13 


45.49 


45.36 


46.03 


0.89 


MHE 


0.13 


44.77 


44.64 


46.03 


0.56 


MHE 


0.13 


45.10 


44.97 


46.03 


0.24 


MHE 


0.13 


45.42 


45.29 


46.03 


0.74 


MHE 


0.13 


44.92 


44.79 


46.03 


0.37 


MHE 


0.13 


45.29 


45.16 


46.03 


0.00 


MHE 


0.13 


45.66 


45.53 


46.03 


0.87 


MHE 


0.13 


44.79 


44.66 


46.03 


0.55 


MHE 


0.13 


45.11 


44.98 


46.03 


0.24 


MHE 


0.13 


45.42 


45.29 


46.03 


0.83 


MHE 


0.13 


44.83 


44.70 


46.03 


0.50 


MHE 


0.13 


45.16 


45.03 


46.03 


0.17 


MHE 


0.13 


45.49 


45.36 


46.03 


1.01 


MHE 


0.13 


44.65 


44.52 


46.03 


0.64 


MHE 


0.13 


45.02 


44.89 


46.03 


0.28 


MHE 


0.13 


45.38 


45.25 



U.S. Geological Survey 



Ashumet Pond Geochemical Barrier - August 2006 



Table 7. Field and laboratory chemical analyses from ground-water samples collected from a temporary drive point below the pond bottom, Ashumet Pond, August 2 - 21 , 2006 

[All phosphorus and nitrogen samples were analyzed at the USGS Natio 
Dissolved oxygen (less than 2 mg/L) and field phosphate were determine 
<, value less than laboratory reporting limit; E, estimated value; — , sam[ 



er Quality Laboratory. |jS/cm, microsiemens per centimeter at 25 °C; mg/L, milligrams p 
using a colorimetric photometer. Dissolved oxygen greater than 2 mg/L was determine 



le laboratory using a 



Field Parameters 



US Geological Survey National Water-Quality Laboratory 



USGS Station Name USGS Location ID 



Specific 
Conductance 

(u.S/cm) 



Temp 

(°C) 



Oxygen, 

dissolved 

(mg/L) 



Field Phosphate 
(mg/L as P) 



Nitrogen, Ammonia Nitrogen, Nitrite plus Nitrogen, Nitrite Phosphorus, 

(mg/L as N) Nitrate (mg/L as N) (mg/L as N) Dissolved (mg/L) 



-FSW 669 


A01 


-FSW 669 


A01 


-FSW 669 


A02 


-FSW 669 


A02 


-FSW 669 


A03 


-FSW 669 


A03 


-FSW 669 


A04 


-FSW 669 


A04 


-FSW 669 


A05 


-FSW 669 


A05 


-FSW 669 


A06 


-FSW 669 


A06 


-FSW 669 


A07 


-FSW 669 


A07 


-FSW 669 


A08 


-FSW 669 


A08 


-FSW 669 


A08 


-FSW 669 


A09 


-FSW 669 


A09 


-FSW 669 


A10 


-FSW 669 


A10 


-FSW 669 


A11 


-FSW 669 


A11 


-FSW 669 


A12 


-FSW 669 


A12 


-FSW 669 


A13 


-FSW 669 


A13 


-FSW 669 


A14 


-FSW 669 


A14 


-FSW 669 


A14 


-FSW 669 


A15 


-FSW 669 


A15 


-FSW 669 


A15 


-FSW 669 


A16 


-FSW 669 


A16 


-FSW 669 


A16 


-FSW 669 


A17 


-FSW 669 


A17 


-FSW 669 


A17 


-FSW 669 


A18 


-FSW 669 


A18 


-FSW 669 


A18 


-FSW 669 


A19 


-FSW 669 


A19 


-FSW 669 


A20 


-FSW 669 


A20 


-FSW 669 


A21 


-FSW 669 


A21 


-FSW 669 


A21 


-FSW 669 


A22 


-FSW 669 


A22 


-FSW 669 


A22 


-FSW 669 


A23 


-FSW 669 


A23 


-FSW 669 


A23 


-FSW 669 


A24 


-FSW 669 


A24 


-FSW 669 


A24 


-FSW 669 


A25 


-FSW 669 


A25 


-FSW 669 


A25 


-FSW 669 


A26 


-FSW 669 


A26 


-FSW 669 


A27 


-FSW 669 


A27 


-FSW 669 


A27 


-FSW 669 


A28 


-FSW 669 


A28 


-FSW 669 


A28 


-FSW 669 


A29 


-FSW 669 


A29 


-FSW 669 


A29 


-FSW 669 


A30 


-FSW 669 


A30 


-FSW 669 


A30 


-FSW 669 


A31 


-FSW 669 


A31 


-FSW 669 


A31 


-FSW 669 


A32 


-FSW 669 


A32 


-FSW 669 


A33 



155.0 


24.7 






0.03 


0.78 


0.030 


<0.06 


<0.002 


0.66 


149.0 


21.8 






0.43 


1.03 


0.018 


<0.06 


<0.002 


0.60 


191.0 


25.0 






0.160 


0.24 


0.012 


<0.06 


<0.002 


0.19 


187.0 


22.3 






0.400 


0.39 


0.016 


<0.06 


<0.002 


0.31 


102.0 


26.9 






0.170 


1.37 


0.496 


<0.06 


<0.002 


1.25 


100.0 


21.5 






0.810 


0.99 


0.447 


<0.06 


<0.002 


0.97 


192.0 


28.2 






0.055 


0.05 


0.014 


<0.06 


<0.002 


0.03 


191.0 


25.6 






0.870 


0.00 


0.018 


<0.06 


<0.002 


E0.01 


161.0 


27.8 






0.070 


0.24 


0.433 


<0.06 


<0.002 


0.17 


146.0 


26.5 






0.230 


0.54 


0.349 


<0.06 


<0.002 


0.49 


138.0 


28.2 






0.555 


0.00 


0.043 


<0.06 


<0.002 




173.0 


23.60 






0.09 


0.02 


0.241 


<0.06 


<0.002 


<0.02 


144.0 


26.8 


4.96 


0.435 


0.00 


0.031 


<0.06 


<0.002 


<0.02 


176.0 


21.7 


5.73 


0.635 


0.05 


0.231 


<0.06 


<0.002 


E0.01 


182.0 


26.4 


5.53 


0.160 


0.13 


0.146 


<0.06 


<0.002 


<0.02 


173.0 


25.8 


5.49 


0.385 


0.11 


0.063 


<0.06 


<0.002 


<0.02 


182.0 


21.8 


5.77 


0.18 


0.10 


0.243 


<0.06 


<0.002 


<0.02 


162.1 


26.7 


5.51 


0.200 


0.02 


0.955 


<0.06 


<0.002 


<0.02 


142.4 


24.9 


5.60 


0.155 


0.02 


2.200 


<0.06 


<0.002 


<0.02 


120.8 


27.5 


5.91 


6.680 


0.28 


0.030 


<0.06 


<0.002 


<0.02 


139.1 


22.8 


6.12 


0.345 


0.42 


0.192 


<0.06 


<0.002 




176.6 


23.2 


6.18 


0.200 


1.32 


0.063 


0.45 


0.002 


1.03 


198.0 


16.7 


6.21 


0.620 


1.11 


0.127 


0.90 


<0.002 


1.01 


117.5 


21.5 


7.02 


0.000 


0.16 


0.017 


<0.06 


<0.002 


0.13 


107.0 


17.6 


6.16 


3.840 


0.95 


E 0.010 


0.78 


<0.002 


0.85 


121.9 


23.8 


5.65 


3.790 


0.42 


E 0.010 


0.86 


<0.002 


0.37 


123.0 


17.9 


5.78 


5.400 


0.36 


0.010 


0.85 


<0.002 


0.25 


196.3 


22.2 


6.10 


0.060 


1.37 


0.092 


<0.06 


<0.002 


1.18 


196.0 


18.4 


6.16 


0.075 


1.34 


0.096 


<0.06 


<0.002 


1.14 


197.0 


16.9 


6.18 


0.290 


1.14 


0.097 


<0.06 


<0.002 


1.07 


128.5 


24.7 


7.21 


0.040 


0.15 


0.252 


<0.06 


<0.002 


0.09 


163.3 


19.9 


8.02 


0.225 


0.07 


0.395 


<0.06 


<0.002 


0.04 


173.5 


17.3 


6.47 


0.485 


0.75 


0.385 


0.67 


<0.002 


0.90 


200.0 


21.3 


7.01 


0.000 


0.13 


0.094 


<0.06 


<0.002 


0.07 


206.0 


18.9 


7.22 


0.400 


0.44 


0.084 


E0.04 


0.004 


0.08 


202.0 


18.3 


7.24 


0.950 


0.67 


0.136 


1.10 


<0.002 


0.59 


143.0 


23.6 


7.33 


0.010 


0.16 


0.384 


<0.06 


<0.002 


0.10 


156.3 


20.4 


7.38 


0.030 


0.11 


0.413 


<0.06 


<0.002 


0.05 


160.5 


17.2 


6.57 


0.200 


0.80 


0.452 


1.19 


<0.002 


0.67 


111.6 


20.4 


7.31 


0.015 


0.24 


0.016 


<0.06 


<0.002 


0.17 


113.0 


19.4 


7.54 


0.385 


0.26 


0.012 


0.20 


E 0.002 


0.19 


105.3 


15.6 


7.12 


4.450 


0.67 


E 0.010 


0.81 


<0.002 


0.64 


80.4 


21.8 


6.46 


4.220 


0.52 


0.010 


0.71 


<0.002 


0.40 


81.1 


17.2 


6.17 


5.020 


0.44 


0.011 


0.70 


<0.002 


0.36 


81.1 


19.6 


6.47 


4.640 


0.31 


E 0.009 


0.81 


<0.002 


0.24 


78.8 


17.6 


6.50 


4.950 


0.31 


0.010 


0.74 


<0.002 


0.21 


170.0 


20.1 


6.04 


0.210 


1.65 


0.121 


<0.06 


<0.002 


1.32 


178.0 


17.7 


6.06 


0.500 


1.55 


0.110 


<0.06 


<0.002 


1.31 


174.7 


14.2 


6.06 


0.490 


1.45 


0.101 


<0.06 


<0.002 


1.30 


172.0 


22.8 


7.01 


0.000 


0.03 


0.583 


<0.06 


E 0.001 


0.04 


211.0 


18.3 


6.53 


0.150 


1.19 


0.869 


<0.06 


<0.002 


0.93 


203.0 


14.9 


6.22 


0.095 


1.55 


0.871 


<0.06 


<0.002 


1.56 


157.4 


21.8 


7.09 


0.070 


0.05 


0.583 


<0.06 


<0.002 


0.02 


168.3 


18.6 


7.74 


0.055 


0.20 


0.602 


<0.06 


<0.002 


0.15 


167.6 


15.1 


6.52 


0.130 


1.53 


0.613 


<0.06 


<0.002 


1.52 


149.0 


21.6 


7.50 


0.010 


0.05 


0.470 


<0.06 


<0.002 


0.06 


158.2 


17.0 


7.50 


0.030 


0.11 


0.441 


<0.06 


<0.002 


0.15 


156.5 


15.5 


6.74 


0.020 


1.19 


0.468 


0.22 


<0.002 


1.24 


99.4 


20.1 


8.09 


0.010 


0.16 


E 0.010 


<0.06 


<0.002 


0.09 


95.7 


17.5 


7.49 


1.970 


0.24 


E 0.010 


0.66 


0.006 


0.19 


91.8 


15.5 


6.70 


1.840 


0.44 


0.010 


1.20 


<0.002 


0.45 


96.0 


22.7 


6.73 


0.055 


0.88 


E 0.009 


1.60 


0.111 


0.72 


93.3 


21.3 


6.77 


1.440 


0.46 


0.011 


1.59 


0.032 


0.37 


186.6 


16.8 


6.02 


0.190 


1.16 


0.144 


0.18 


E 0.002 


1.31 


179.7 


14.5 


6.08 


4.480 


1.39 


0.191 


E0.05 


<0.002 


1.27 


175.7 


13.3 


6.08 


0.250 


1.27 


0.215 


<0.06 


<0.002 


1.26 


235.0 


19.4 


7.10 


0.000 


0.00 


0.754 


<0.06 


<0.002 


0.03 


235.0 


17.2 


6.71 


3.680 


0.00 


0.991 


<0.06 


0.011 


<0.02 


228.0 


14.1 


6.30 




1.13 


1.010 


<0.06 


<0.002 


1.15 


180.5 


20.8 


7.40 


0.000 


0.16 


0.918 


<0.06 


<0.002 


0.15 


207.0 


16.5 


7.23 


2.120 


0.07 


1.080 


<0.06 


<0.002 


0.08 


188.4 


16.5 


6.46 


0.640 


1.47 


0.940 


<0.06 


<0.002 


1.37 


163.5 


21.5 


7.33 


0.000 


0.36 


0.795 


<0.06 


<0.002 


0.34 


163.7 


19.1 


7.57 


0.350 


0.23 


0.783 


<0.06 


<0.002 


0.18 


169.1 


15.9 


6.62 


2.840 


1.44 


0.781 


<0.06 


<0.002 


1.50 


107.5 


21.3 


8.21 


0.045 


0.24 


0.019 


0.23 


0.008 


0.09 


106.0 


19.1 


7.20 


5.000 


0.18 


0.014 


<0.06 


<0.002 


0.18 


96.4 


16.2 


6.67 


5.260 


0.65 


E 0.010 


0.79 


<0.002 


0.62 


84.1 


22.0 


6.17 


0.070 


0.46 


E 0.009 


1.74 


0.016 


0.35 


84.6 


16.7 


6.42 


5.150 


0.34 


0.011 


1.72 


0.009 


0.28 


99.3 


22.7 


6.55 


0.300 


0.49 


1.260 


1.75 


<0.002 


0.47 



U.S. Geological Survey 



Ashumet Pond Geochemical Barrier - August 2006 









Field Parameters 


US Geological Survey National Water-Quality Laboratory 


USGS Station Name 


USGS Location ID 


Specific 
Conductance 

(u,S/cm) 


Temp 

(°C) 


pH 


Oxygen, 

dissolved 

(mg/L) 


Field Phosphate 
(mg/L as P) 


Nitrogen, Ammonia 
(mg/L as N) 


Nitrogen, Nitrite plus 
Nitrate (mg/L as N) 


Nitrogen, Nitrite 
(mg/L as N) 


Phosphorus, 
Dissolved (mg/L) 


MA 


FSW 669-A33 


08-57 


99.1 


17.1 


6.62 


0.705 


0.47 


1.250 


1.78 


<0.002 


0.41 


MA 


FSW 669-A34 


09-00 


196.4 


20.8 


6.97 


0.020 


0.05 


E 0.652 


<0.06 


E 0.001 


0.04 


MA 


FSW 669-A34 


09-00 


205.0 


17.4 


7.69 


0.000 


0.03 


E 0.690 


<0.06 


E 0.002 


0.04 


MA 


FSW 669-A34 


09-00 


195.8 


14.0 


6.99 


0.110 


1.40 


0.717 


<0.06 


<0.002 


1.38 


MA 


FSW 669-A35 


09-08 


199.0 


21.4 


7.11 


0.000 


0.11 


0.798 


<0.06 


<0.002 


0.07 


MA 


FSW 669-A35 


09-08 


207.0 


18.1 


7.95 


0.265 


0.16 


0.841 


<0.06 


<0.002 


0.14 


MA 


FSW 669-A35 


09-08 


206.0 


15.2 


6.90 


0.290 


1.60 


0.896 


<0.06 


<0.002 


1.44 


MA 


FSW 669-A36 


09-16 


168.5 


20.3 


7.51 


0.000 


0.24 


0.901 


<0.06 


<0.002 


0.37 


MA 


FSW 669-A36 


09-16 


161.0 


18.2 


8.12 


0.100 


0.41 


0.905 


<0.06 


<0.002 


0.36 


MA 


FSW 669-A36 


09-16 


160.4 


17.6 


7.04 


0.585 


1.68 


0.832 


<0.06 


<0.002 


1.69 


MA 


FSW 669-A37 


09-24 


109.5 


20.1 


7.89 


0.110 


0.39 


0.368 


<0.06 


<0.002 


0.40 


MA 


FSW 669-A37 


09-24 


111.2 


19.0 


7.60 


2.210 


0.51 


0.179 


0.28 


0.005 


0.32 


MA 


FSW 669-A37 


09-24 


109.0 


17.3 


6.97 


0.560 


1.03 


0.073 


1.23 


<0.002 


1.43 


MA 


FSW 669-A38 


09-35 


92.5 


22.8 


8.10 


0.055 


0.33 


0.047 


<0.06 


<0.002 


<0.02 


MA 


FSW 669-A38 


09-35 


89.5 


22.1 


6.85 


2.850 


0.38 


E 0.010 


0.95 


0.039 


0.48 


MA 


FSW 669-A38 


09-35 


83.8 


19.4 


6.29 


2.410 


0.62 


E 0.005 


0.92 


<0.002 


0.60 


MA 


FSW 669-A39 


09-46 


99.3 


21.1 


6.41 


0.210 


0.10 


1.010 


1.80 


<0.002 


0.62 


MA 


FSW 669-A39 


09-46 


95.8 


15.5 


6.24 


0.235 


0.72 


1.620 


1.83 


<0.002 


0.76 


MA 


FSW 669-A40 


10-00 


199.6 


19.2 


6.27 


0.020 


1.21 


0.429 


<0.06 


<0.002 


1.10 


MA 


FSW 669-A40 


10-00 


206.0 


17.7 


6.28 


3.420 


1.32 


0.481 


E0.04 


<0.002 


1.11 


MA 


FSW 669-A40 


10-00 


207.0 


14.6 


6.30 


0.545 


1.27 


0.512 


<0.06 


<0.002 


1.17 


MA 


FSW 669-A41 


10-08 


184.2 


19.8 


7.16 


0.000 


0.08 


E 0.567 


<0.06 


E 0.002 


0.09 


MA 


FSW 669-A41 


10-08 


195.3 


17.1 


7.64 


0.015 


0.02 


E 0.676 


<0.06 


E 0.002 


0.04 


MA 


FSW 669-A41 


10-08 


200.0 


15.9 


7.28 


6.090 


0.15 


E 0.696 


<0.06 


E 0.001 


0.09 


MA 


FSW 669-A42 


10-16 


207.0 


19.6 


7.71 


0.000 


0.08 


0.813 


<0.06 


<0.002 


0.11 


MA 


FSW 669-A42 


10-16 


214.0 


16.9 


7.33 


0.090 


0.91 


0.832 


<0.06 


<0.002 


0.82 


MA 


FSW 669-A42 


10-16 


205.0 


16.8 


6.79 




1.27 


0.851 


<0.06 


<0.002 


1.35 


MA 


FSW 669-A43 


10-24 


119.0 


20.7 


7.17 


0.060 


0.31 


0.466 


<0.06 


<0.002 


0.35 


MA 


FSW 669-A43 


10-24 


117.7 


19.0 


7.76 


1.790 


0.13 


0.373 


<0.06 


<0.002 


0.13 


MA 


FSW 669-A43 


10-24 


116.0 


15.8 


7.06 


0.400 


1.68 


0.077 


0.88 


<0.002 


1.50 


MA 


FSW 669-A44 


10-35 


97.0 


18.6 


7.39 


0.000 


0.03 


E 0.014 


<0.06 


E 0.001 


0.10 


MA 


FSW 669-A44 


10-35 


83.4 


16.9 


6.42 


3.950 


0.80 


0.010 


0.79 


0.002 


0.63 


MA 


FSW 669-A44 


10-35 


82.8 


15.7 


6.18 


4.530 


0.62 


0.010 


0.82 


<0.002 


0.67 


MA 


FSW 669-A45 


10-46 


93.9 


21.4 


6.02 


0.070 


0.49 


E 0.007 


1.88 


0.042 


0.43 


MA 


FSW 669-A45 


10-46 


90.5 


19.1 


5.93 


0.120 


0.54 


<0.010 


1.93 


0.035 


0.45 


MA 


FSW 669-A46 


10-57 


100.7 


20.4 


6.10 


0.060 


0.93 


1.430 


2.15 


<0.002 


0.76 


MA 


FSW 669-A46 


10-57 


100.7 


17.3 


6.18 


0.225 


0.91 


1.650 


2.17 


E 0.001 


0.81 


MA 


FSW 669-A46 


10-57 


101.5 


15.9 


6.35 


0.545 


0.93 


1.780 


2.20 


<0.002 


0.79 


MA 


FSW 669-A47 


11-00 


180.1 


17.5 


6.26 


0.160 


1.27 


0.080 


<0.06 


E 0.001 


0.91 


MA 


FSW 669-A47 


11-00 


189.6 


16.3 


6.30 


0.495 


1.06 


0.051 


<0.06 


E 0.001 


0.90 


MA 


FSW 669-A47 


11-00 


191.2 


14.0 


6.18 


0.195 


1.06 


0.137 


<0.06 


E 0.001 


0.90 


MA 


FSW 669-A48 


11-08 


199.3 


18.4 


7.06 


0.000 


0.57 


0.740 


<0.06 


<0.002 


0.15 


MA 


FSW 669-A48 


11-08 


199.4 


16.2 


7.05 


6.100 


1.47 


0.756 


<0.06 


E 0.001 


1.05 


MA 


FSW 669-A48 


11-08 


198.3 


13.2 


6.69 


0.250 


1.44 


0.795 


<0.06 


E 0.002 


1.50 


MA 


FSW 669-A49 


11-16 


170.9 


21.2 


5.89 


0.025 


0.23 


0.763 


<0.06 


<0.002 


0.17 


MA 


FSW 669-A49 


11-16 


175.4 


17.6 


7.89 


3.530 


0.13 


0.773 


<0.06 


E 0.001 


0.10 


MA 


FSW 669-A49 


11-16 


180.4 


19.2 


6.89 


0.410 


1.55 


0.792 


<0.06 


E 0.001 


1.43 


MA 


FSW 669-A50 


11-24 


138.3 


20.9 


7.87 


0.020 


0.23 


0.479 


<0.06 


<0.002 


0.18 


MA 


FSW 669-A50 


11-24 


138.2 


17.7 


8.38 


0.180 


0.23 


0.466 


<0.06 


E 0.001 


0.17 


MA 


FSW 669-A50 


11-24 


149.7 


16.6 


7.54 


0.850 


1.44 


0.464 


<0.06 


<0.002 


1.18 


MA 


FSW 669-A51 


11-35 


102.5 


21.1 


7.8 


0.000 


0.10 


0.019 


<0.06 


<0.002 


0.15 


MA 


FSW 669-A51 


11-35 


103.4 


18.7 


7.60 


0.000 


0.00 


0.012 


<0.06 


E 0.001 


0.05 


MA 


FSW 669-A51 


11-35 


95.6 


17.2 


6.61 


6.000 


0.52 


E 0.006 


0.64 


<0.002 


0.47 


MA 


FSW 669-A52 


11-46 


87.5 


20.0 


6.28 


2.710 


0.05 


<0.010 


0.43 


E 0.002 


0.07 


MA 


FSW 669-A52 


11-46 


86.5 


15.7 


6.03 


5.420 


0.34 


E 0.007 


0.78 


<0.002 


0.33 


MA 


FSW 669-A53 


11-57 


110.5 


19.0 


5.67 


4.210 


0.24 


<0.010 


1.06 


<0.002 


0.21 


MA 


FSW 669-A53 


11-57 


111.1 


16.2 


5.83 


5.020 


0.16 


<0.010 


1.00 


<0.002 


0.16 


MA 


FSW 669-A54 


12-00 


312.0 


16.5 


6.20 


0.200 


0.96 


0.348 


0.18 


0.007 


0.92 


MA 


FSW 669-A54 


12-00 


298.0 


14.6 


6.26 


0.600 


0.95 


0.417 


0.18 


E 0.002 


0.98 


MA 


FSW 669-A54 


12-00 


229.0 


14.7 


6.41 


0.630 


1.39 


0.524 


0.06 


<0.002 


1.28 


MA 


FSW 669-A55 


12-08 


196.8 


19.3 


6.58 


0.005 


0.21 


0.722 


<0.06 


<0.002 


0.16 


MA 


FSW 669-A55 


12-08 


191.9 


16.7 


6.82 


0.145 


1.44 


0.703 


<0.06 


<0.002 


1.40 


MA 


FSW 669-A55 


12-08 


188.2 


15.8 


7.01 


0.345 


1.29 


0.708 


<0.06 


<0.002 


1.51 


MA 


FSW 669-A56 


12-16 


217.0 


20.2 


7.59 


0.000 


0.29 


0.242 


<0.06 


<0.002 


0.16 


MA 


FSW 669-A56 


12-16 


236.0 


21.6 


7.80 


0.035 


0.10 


0.217 


<0.06 


<0.002 


0.05 


MA 


FSW 669-A56 


12-16 


228.0 


16.5 


6.98 


0.295 


0.88 


0.207 


E0.05 


<0.002 


0.78 


MA 


FSW 669-A57 


12-24 


146.7 


20.5 


8.21 


0.050 


0.15 


0.030 


<0.06 


<0.002 


0.07 


MA 


FSW 669-A57 


12-24 


145.6 


18.0 


7.77 


0.015 


0.11 


0.012 


<0.06 


<0.002 


0.05 


MA 


FSW 669-A57 


12-24 


131.9 


16.1 


6.93 


1.660 


0.88 


E 0.010 


0.35 


<0.002 


0.73 


MA 


FSW 669-A58 


12-35 


115.3 


22.1 


7.42 


0.010 


0.11 


E 0.009 


<0.06 


<0.002 


0.06 


MA 


FSW 669-A58 


12-35 


114.3 


18.5 


7.93 


0.005 


0.10 


<0.010 


<0.06 


0.010 


0.06 


MA 


FSW 669-A58 


12-35 


110.1 


16.4 


6.45 


5.640 


0.47 


E 0.007 


0.70 


<0.002 


0.43 


MA 


FSW 669-A59 


12-46 


103.9 


23.6 


7.25 


0.035 


0.08 


0.011 


0.10 


0.002 


<0.02 


MA 


FSW 669-A59 


12-46 


96.3 


16.7 


6.23 


5.490 


0.39 


E 0.008 


0.75 


<0.002 


0.30 


MA 


FSW 669-A60 


12-57 


83.1 


22.1 


6.05 


6.940 


0.34 


<0.010 


0.77 


<0.002 


0.28 


MA 


FSW 669-A60 


12-57 


81.4 


18.9 


6.13 


6.690 


0.33 


<0.010 


0.77 


<0.002 


0.24 


MA 


FSW 669-A61 


13-00 


144.0 


17.4 


6.70 


0.395 


1.40 


0.089 


<0.06 


<0.002 


1.28 


MA 


FSW 669-A61 


13-00 


161.0 


14.2 


6.54 


0.920 


1.27 


0.044 


<0.06 


<0.002 


1.12 


MA 


FSW 669-A61 


13-00 


155.6 


14.0 


6.66 


0.700 


1.24 


0.062 


<0.06 


<0.002 


1.14 


MA 


FSW 669-A62 


13-10 


225.0 


18.3 


7.14 


0.005 


0.08 


E 0.009 


<0.06 


<0.002 


0.06 


MA 


FSW 669-A62 


13-10 


223.0 


14.2 


6.88 


0.000 


0.11 


E 0.008 


0.26 


0.006 


0.12 


MA 


FSW 669-A62 


13-10 


208.0 


14.2 


6.16 


3.500 


0.65 


<0.010 


0.64 


<0.002 


0.62 


MA 


FSW 669-A63 


13-16 


183.4 


19.2 


7.19 


0.000 


0.02 


E 0.010 


E0.06 


E 0.002 


0.03 


MA 


FSW 669-A63 


13-16 


174.2 


16.2 


6.39 


2.900 


0.05 


E 0.005 


0.41 


0.003 


0.12 


MA 


FSW 669-A63 


13-16 


161.9 


14.4 


5.81 


5.990 


0.21 


E 0.006 


0.50 


<0.002 


0.39 



U.S. Geological Survey 



Ashumet Pond Geochemical Barrier - August 2006 



USGS Station Name USGS Location ID 



Specific 
Conductance 

(u,S/cm) 



Field Parameters 



Temp 
(°C) 



Oxygen, 

dissolved 

(mg/L) 



US Geological Survey National Water-Quality Laboratory 



Field Phosphate 
(mg/L as P) 



Nitrogen, Ammonia Nitrogen, Nitrite plus 
(mg/L as N) Nitrate (mg/L as N) 



Nitrogen, Nitrite 
(mg/L as N) 



Phosphorus, 
Dissolved (mg/L) 



-FSW 669-A64 


13-24 


130.7 


18.3 


6.75 


0.000 


0.13 


0.011 


<0.06 


<0.002 


0.10 


-FSW 669-A64 


13-24 


128.8 


16.4 


7.64 


0.145 


0.03 


0.011 


<0.06 


<0.002 


0.05 


-FSW 669-A64 


13-24 


122.4 


15.8 


6.54 


6.610 


0.21 


E 0.006 


0.51 


<0.002 


0.24 


-FSW 669-A65 


13-35 


92.8 


19.1 


7.34 


0.000 


0.00 


0.010 


<0.06 


<0.002 


E0.01 


-FSW 669-A65 


13-35 


104.5 


16.7 


7.19 


0.875 


0.00 


<0.010 


0.30 


0.003 


<0.02 


-FSW 669-A65 


13-35 


82.0 


15.9 


6.25 


7.140 


0.18 


<0.010 


0.72 


<0.002 


0.35 


-FSW 669-A66 


13-46 


81.4 


17.9 


6.20 


2.290 


0.15 


0.014 


0.24 


<0.002 


0.14 


-FSW 669-A66 


13-46 


92.0 


18.2 


6.18 


6.620 


0.16 


<0.010 


0.53 


<0.002 


0.17 


-FSW 669-A67 


14-00 


155.5 


16.4 


6.28 


0.355 


0.88 


<0.010 


0.22 


E 0.002 


0.83 


-FSW 669-A67 


14-00 


151.2 


16.6 


6.31 


2.320 


0.99 


E 0.006 


0.32 


<0.002 


0.86 


-FSW 669-A67 


14-00 


160.6 


15.0 


6.18 


1.670 


1.08 


<0.010 


0.46 


<0.002 


0.84 


-FSW 669-A68 


14-11 


155.1 


19.4 


7.19 


0.000 


0.03 


<0.010 


<0.06 


<0.002 


0.04 


-FSW 669-A68 


14-11 


162.3 


16.2 


7.45 


0.000 


0.00 


E 0.006 


E0.04 


0.011 


<0.02 


-FSW 669-A68 


14-11 


139.8 


14.9 


6.06 


6.460 


0.39 


<0.010 


0.55 


<0.002 


0.38 


-FSW 669-A69 


14-16 


127.1 


18.8 


6.60 


0.005 


0.08 


0.017 


<0.06 


E 0.001 


0.03 


-FSW 669-A69 


14-16 


128.8 


17.0 


6.60 




0.03 


0.013 


0.41 


0.009 


<0.02 


-FSW 669-A69 


14-16 


106.7 


15.1 


5.93 


6.910 


0.28 


E 0.006 


0.61 


<0.002 


0.26 


-FSW 669-A70 


14-24 


84.3 


19.9 


6.36 


2.370 


0.02 


E 0.009 


0.25 


<0.002 


<0.02 


-FSW 669-A70 


14-24 


103.2 


18.4 


5.92 


5.660 


0.21 


0.011 


0.54 


0.004 


0.18 


-FSW 669-A70 


14-24 


82.7 


17.1 


5.80 


7.440 


0.26 


<0.010 


0.55 


<0.002 


0.34 


-FSW 669-A71 


14-35 


130.9 


19.6 


6.79 


0.030 


0.02 


0.022 


E0.03 


0.004 


0.02 


-FSW 669-A71 


14-35 


114.2 


17.7 


6.06 


6.210 


0.03 


E 0.009 


0.53 


0.002 


E0.02 


-FSW 669-A71 


14-35 


101.3 


16.1 


5.84 


8.380 


0.16 


<0.010 


0.55 


<0.002 


0.11 


-FSW 669-A72 


14-46 


100.0 


21.2 


5.51 


7.620 


0.10 


<0.010 


0.53 


<0.002 


0.11 


-FSW 669-A72 


14-46 


99.6 


18.4 


5.66 


8.370 


0.08 


E 0.006 


0.55 


<0.002 


0.09 


-FSW 669-A72 


14-46 


99.0 


16.5 


5.57 


8.990 


0.10 


E 0.005 


0.55 


<0.002 


0.09 


-FSW 669-A73 


14-57 


106.2 


21.4 


6.19 


8.510 


0.07 


E 0.006 


0.48 


<0.002 


0.04 


-FSW 669-A73 


14-57 


108.0 


17.1 


6.27 


8.060 


0.05 


E 0.007 


0.48 


<0.002 


0.02 


-FSW 669-A74 


15-00 


142.8 


17.0 


6.02 


7.010 


0.49 


<0.010 


0.49 


<0.002 


0.41 


-FSW 669-A74 


15-00 


162.1 


15.7 


5.95 


7.690 


0.44 


E 0.007 


0.58 


<0.002 


0.36 


-FSW 669-A75 


15-16 


79.9 


17.6 


5.39 


7.880 


0.31 


<0.010 


0.56 


<0.002 


0.26 


-FSW 669-A75 


15-16 


85.1 


16.6 


5.77 


8.040 


0.15 


<0.010 


0.54 


<0.002 


0.36 


-FSW 669-A76 


15-35 


115.2 


18.0 


6.10 


9.090 


0.28 


<0.010 


0.52 


<0.002 


0.19 


-FSW 669-A76 


15-35 


108.6 


18.5 


6.45 


8.500 


0.20 


<0.010 


0.49 


<0.002 


0.14 



Additional Push Points Near the Shoreline - Field Measurements Only 



63.3 
223.0 



197.6 


20.0 


108.7 


15.5 


210.0 


18.7 


189.5 


19.7 


133.1 


16.0 


201.0 


16.6 


162.2 


17.6 


141.1 


14.0 


261.0 


16.2 


118.3 


14.7 


78.4 


16.7 



14.4 
16.3 



0.15 
0.03 
0.00 
1.48 
0.02 
0.02 
1.24 
1.53 
0.03 
1.24 
1.47 
0.00 
0.05 
1.50 
0.02 
0.05 
1.09 
0.07 
0.13 
1.16 
0.70 
0.39 
1.04 
0.11 
1.17 
1.06 
0.15 
0.70 
0.15 
0.59 
0.11 
1.40 
0.72 
0.67 



Last Opened 1/22/2007 1:56:17 PM by MC Y:\Figures\SPEIM\APB\2006\TechMemo\GIS\Arcmap\APB_06TM_Fig01-01.mxd 
^J ■ " "" 




az s 



Legend 

---■ Town Boundary 



Data Source: AFCEE, MMR-AFCEE Data Warehouse 



Massachusetts Military Reservation 
Boundary 



4 



0.7 1.4 



FIGURE 1-1 

LOCATION OF 
ASHUMET POND 

AFCEE - Massachusetts Military Reservation 
Final Ashumet Pond 2006 Phosphorus 
Barrier Technical Memorandum 

CH2MHILL 



Last Opened 1/22/2007 2:05:39 PM by MC Y:\Figures\SPEIM\APB\2006\TechMemo\GIS\Arcmap\APB_06TM_Fig01-02.mxd 




Ashumet 
Pond 



Legend 



1 1 
1 1 


Abandoned Sewage 
Treatment Beds 
Pond (Based on April 1997 
Aerial Photography) 


Phosphorus Plume 
Concentrations from 
USGS (1999 Data) 

I I 1.0 mg/L 


1 — 1 


• 


Geochemical Barrier 
Phosphorus Isopleths (mg/L) 
from USGS (1999 Data) 
MMR Boundary 
USGS Drive Points 
Installed for AFCEE (1999) 


I I 2.0 mg/L 
I I 3.0 mg/L 
I I 4.0 mg/L 
I I 5.0 mg/L 



N 

I 



170 340 



I Feet 



FIGURE 1-2 

PHOSPHORUS PLUME AND 
DISCHARGE AREA IN 
ASHUMET POND (1999) 

AFCEE - Massachusetts Military Reservation 
Final Ashumet Pond 2006 Phosphorus 
Barrier Technical Memorandum 

CH2MHILL 



Last Opened 2/26/2007 8:50:58 AM by MC Y:\Figures\SPEIM\APB\2006\TechMemo\GIS\Arcmap\APB_06TM_Fig02-01.mxd 




Legend 









Ashumet Pond Barrier 





Transect Line (A-A') 


o 


Diffusion Chamber 


▲ 


Northern Horizontal Multiport Sampler 


• 


Southern Horizontal Multiport Sampler 





Pond-Bottom Piezometer 


e 


Vertical Multilevel Sampler 


© 


Stake-out Points of Barrier 


^ 


Monitoring Well 


A 


USGS Seep Sample 



4 



Feet 

Data Source: AFCEE, January 2007, MMR-AFCEE 
Data Warehouse. 1997 Aerial Photography. 



FIGURE 2-1 

USGS PERMANENT BARRIER 
SAMPLING LOCATIONS 

AFCEE - Massachusetts Military Reservation 
Final Ashumet Pond 2006 Phosphorus 
Barrier Technical Memorandum 

CH2MHILL 



Y:\Figures\SPEIM\APB\2006\TechMemo\Corel\APR 06TM Fig02-02.cdr 02/05/07 mcb 



FEET A 
70 

60 

50 

40 

30 

20 

10 

-10 
-20 
-30 
-40 
-50 
-60 
-70 



A' 



F621 



F61 9 Land surface 



Gcochcmical Barrier 




Ashumei 

Pond 



2X vertical exaggeration 



PHOSPHORUS, in milligrams per liter 



-300 -250 -200 -150 -100 -50 50 100 

DISTANCE FROM ASHUMET POND SHORELINE, IN FEET 



150 



200 



Legend 



Data Source: USGS, August 2006 



> 1.0 
0.5-1.0 
0.1 -0.5 



Vertical Extent of Phosphorus in Pond-Bottom Ground Water (2006) 
Concentrations in Milligrams Per Liter as P. Interval Varies 



FIGURE 2-2 

DISSOLVED PHOSPHORUS 
CONCENTRATIONS ALONG CROSS- 
SECTION A-A 

AFCEE - Massachusetts Military Reservation 
Final Ashumet Pond 2006 Phosphorus Barrier 
Technical Memorandum 

CH2MHILL — 



Y:\Figures\SPEIM\APB\2006\TechMemo\Corel\APR_06TM_Fig02-03.cdr 02/05/07 mcb 



Geochemtcal Barrier 




A' 



Ashumet 
Pond 



NITRATE, in milligrams per liter as N 



-300 -250 -200 -150 -100 -50 50 100 

DISTANCE FROM ASHUMET POND SHORELINE, IN FEET 



150 



200 



1USGS 



Legend 

□ >2.0 

I I 1.0-2.0 
I | 0.5-1.0 
I I 0.1-0.5 



Data Source: USGS, August 2006 



Vertical Extent of Nitrate in Pond-Bottom Ground Water (2006) 
Concentrations in Milligrams Per Liter as N. Interval Varies 



FIGURE 2-3 



NITRATE CONCENTRATIONS ALONG 
CROSS-SECTION A-A' 

AFCEE - Massachusetts Military Reservation 
Final Ashumet Pond 2006 Phosphorus Barrier 
Technical Memorandum 



CH2MHILL 



Y:\Figures\SPEIM\APB\2006\TechMemo\Corel\APR_06TM_Fig02-04.cdr 02/05/07 mcb 




-300 -250 



-200 -150 -100 -50 50 100 

DISTANCE FROM ASHUMET POND SHORELINE, IN FEET 



1 50 200 




T *^ lii/ '""'' ;iJ '""'^ 



M 



Legend 



Data Source: USGS, August 2006 



> 1.0 
0.5-1.0 



Vertical Extent of Ammonium in Pond-Bottom Ground Water (2006) 
Concentrations in Milligrams Per Liter as N. Interval Varies 



0.1 -0.5 



FIGURE 2-4 



AMMONIUM CONCENTRATIONS 
ALONG CROSS-SECTION A-A' 

AFCEE - Massachusetts Military Reservation 

Final Ashumet Pond 2006 Phosphorus Barrier Technical 

Memorandum 

CH2MHILL - 



— 




001-20 



mm 




© 15-00 

©15-16 ■ 

© 15-35 



Al4-(-04) 



© 12-57 




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@o4-oo ©V 4 S x ' © ° 6 - 46 

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© 04-24 
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280 


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280 


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( 

280 


).5 FEET 

050 280070 280 
I ■ ■ 


090 


280 


110 




280 


010 


280 


030 


1.5 FEET 

280050 280 
p 1 


070 


280 


090 


280 


110 




280 


010 


280 


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3.0 FEE 

280050 280 
\ 1 


070 


280 


090 


280 


110 






















/ 


























/ 


























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© 

O 

CM 
CO 

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c 


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/ ° 




















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r oo 
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3 


> / 


















/ / I O t 

J / of 

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A" 


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/°° 


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AgAJ |OZ 






















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9) 


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jTQ 






















V 




















% 


o\ 




/ 














""*" 




% 





o 




















O 
























% 





o 






























15 3 


6 


] 90 


120 


Feet 
















15 3 


6( 


] 90 


120 


Feet 
















15 3 


6( 


) 90 


120 


Feet 


© 

CM 
CO 
















5 10 E0 &^^ 


40 Meters 
















5 





20 


30 


40 Meiers 
















5 





20 


30 40 Meters 


280 


910 


280 


)30 


280 


350 280070 280090 280 


110 




280 


310 


280 


)30 


280050 280 


D70 280 


390 


280110 




280 


310 


280 


330 


280050 280 


370 


280 


390 


280110 




o Temporary Drive Point 










IUSGS 























































































Legend 



04-08 



Shoreline (Delineated 
by USGS July, 2006) 

*Barrier Boundary 

USGS Location ID 
(See Appendix A) 



*Barrier boundary delineated by ECC; shoreward 
edge refined based on GPS readings. 



USGS Temporary Drive Point 
Sampling Locations by Depth (ft): 

# 0.5 and 1.5 
© 0.5 and 3.0 

# 0.5, 1.5 and 3.0 
A 0.5 (Field Measurements Only) 



Data Source: USGS 2006; 
1997 Aerial Photography from AFCEE 



1 



25 50 



Feet 



FIGURE 2-5 

USGS TEMPORARY DRIVE 
POINT LOCATIONS 

AFCEE - Massachusetts Military Reservation 
Final Ashumet Pond 2006 Phosphorus Barrier 
Technical Memorandum 

CH2MHILL 



Y:\Figures\SPEIM\APB\2006\TechMemo\Corel\APR_06TM_Fig2-6.cdr 02/05/07 mcb 



0.5 FEET 



o 


280010 
I 


280030 


280 


350 


280 


)70 


280090 


280 


110 


i 
























oo 














1 










































1 








/ ° 






s 










: 






s 

o 














/ o/ JO 








CM 

oo 














rv 

Oft /" 








o 
oo 












^0 


o y 


o 










oo 








o 
o 




/ 


\shun 
Pont 


/ 




to 

CJ> 






9> > 
















oo 






% 





O 
















5 
















15 30 6( 


) 90 


120 


Feet 


CM 
















24 Meters 






D 3 6 12 1E 




280 


010 


280 


030 


280 


]50 


280 


070 


280 


090 


280 


110 



Depth Below Pond Bottom 



1.5 FEET 



280010 


280030 

1 


280050 


280070 


280090 

1 


280110 

1 
























/if™*! 






JM of 












/Jrw 


















//c°w 


















W ° </ ° 












y^F* / 




Ashutfiet 
Pond 








\ % a/ 
















O 
































15 30 60 90 120 Feet 












24 Meters 




3 6 12 M 


1 

280010 


280 


030 


280 


)50 


1 

280070 


1 
280090 


1 

280110 



3.0 FEET 



280010 


280030 


280050 


280070 


280090 


280110 


o 








CM 
CO 






I I I I 1/ I I I 


o 
2 








JO 


CM 
CO 










o 

CM 








17 


CM 










o 
o 














CM 
CO 














5 ° 

r ° 






o 
oo 










X C 


^ Ashumet 

Po/7d 


o 

CM 
CO 






9j 




\ 

o 




o 
CO 






% 





o 














o 

CM 
CO 














15 30 60 90 120 Feet 


o 
_o> 












Sn^^^sr"" 


ters 


o 

CM 


a 3 & 12 13 24 Me 


CO 


I 

280010 


1 1 1 

280030 


1 

280050 


I 1 

280070 


1 
280090 


1 

280110 





USGS 




Legend 



Data Source: USGS, August 2006 



Temporary Drive Point 



Dissolved Phosphorus 
In Milligrams Per Liter 
AsP 
^^^B 1.70 



Note: Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. Extent of the 
geochemical barrier determined using GPS by CH2M Hill in October 2006. State plane coordinates 
in NAD83 (meters). 



FIGURE 2-6 

CHANGES IN PHOSPHORUS 
CONCENTRATIONS WITH DEPTH IN 
THE GEOCHEMICAL BARRIER 

AFCEE - Massachusetts Military Reservation 

Final Ashumet Pond 2006 Phosphorus Barrier Technical 

Memorandum 

CH2MHILL - 



Y:\Figures\SPEIM\APB\2006\TechMemo\Corel\APR_06TM_Fig02-07.cdr 02/05/07 mcb 



0.5 FEET 



a 


280 


010 


280 


030 


280050 

1 


280070 

1 


280090 


280110 


o 
















tM 


























1 

o 


























1- 

00 


















Jo 
f c 




/ ° 




1 










Jl™* 




CM 
00 
















Cnw 

7<v / 






S 

o 














/a/ °j6 






IN 

oo 


















s 














w\ 
















o /Mr 






Ashi 
Pc 


imet 
nd 


s 

en 






<fc 


o\ 


<b. 














(X 

oo 






% 





o 
















I 














15 3 


6 


) 90 


120 Feet 


CM 
OO 










3 6 12 IS 21 Meters 





























280010 280030 2800S0 280070 280090 280110 



Depth Below Pond Bottom 



1.5 FEET 



280 


010 


28C 


030 


280050 


280070 


280090 


280110 






















































































J 






















K 


/ ° 




















° / 
0/ 

7 




















/a ( °/ 




















£°«A 




































Jro 


o / 








Ashumet 
Pond 












<fe, 























































15 30 eo 90 


120 Feet 
















3 6 12 18 24 Meters 



























280010 280030 280080 280070 280080 280110 



3.0 FEET 



280010 


280030 


280050 


280070 


280090 

1 


280110 


o 
to 

o 
















































CM 

oo 






















o 

s 


















f C 


o 






CM 

CO 


















^*oZ 




o 

o 














L/ 


op 

7 






CM 

00 














/7\ 


oL 
/ ° 






O 

8 














/ °o v^ 


W\ 






CM 
00 












^0 1 




O 

oo 
o 








JPq 


o 

X 


^ 


Ashumet 
Pond 


CM 

CO 








x z 








o 
o 

O) 






% 





o 










■ o 

CM 
00 














15 30 60 90 


120 Feet 


o 

CM 
00 












3 6 12 18 24 Meiers 


280010 


1 

280030 


1 

280050 


1 

280070 


i 

280090 


1 
280110 





H®3 



Legend 



Data Source: USGS, August 2006 



Temporary Drive Point 



Dissolved Nitrate 

In Milligrams Per Liter 

AsN 

" 2.25 




Note: Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. Extent of the 
geochemical barrier determined using GPS by CH2M Hill in October 2006. State plane coordinates 
in NAD83 (meters). 



FIGURE 2-7 

CHANGES IN NITRATE 
CONCENTRATIONS WITH DEPTH IN 
THE GEOCHEMICAL BARRIER 

AFCEE - Massachusetts Military Reservation 

Final Ashumet Pond 2006 Phosphorus Barrier Technical 

Memorandum 

CH2MHILL — 



Y:\Figures\SPEIM\APB\2006\TechMemo\Corel\APR_06TM_Fig02-08.cdr 02/05/07 mcb 



0.5 FEET 



o 


280010 


280030 


280050 


280070 
\ 


280090 
I 


280110 
I 


co 


















/ 






(N 
00 


















7 








1 


















/ 








1- 
CM 

00 


















K 






o 

CM 


















"*5 

o / o 


oo 
















I J OJO 

/"° 7 






o 

s 














U°°«A 


01 

/ ° 






T- 

CM 

OO 
















1 






s 












-^ 


Vo 


J 






o 

CM 

00 












^0 




Po/id 




o 
to 
























o 

CM 
00 


^ 




* 






















1 
















15 3 


60 90 120 Feet 


o 




















CO 












3 5 12 11 


2A Meters 





























Depth Below Pond Bottom 



1.5 FEET 



280010 


280 


)30 


280050 


280070 


280090 

1 


280110 

1 
























~J_ 










































Pw; 








































If 

}J 0/ 

/N / 




















/ o/ 




















/ °° 


0/ 


















/^W 




' # 


































«b. 




















O 
































15 30 60 90 


120 Feet 




























3 & 1? 16 


24 Meters 



























280010 



280070 280090 



280110 



3.0 FEET 

280010 280030 280050 280070 280090 280110 



I ' 















/ 




o 
to 
















/ 






1" 

CM 
CO 


















/ 








o 


















W 


o 






T- 
CM 

CO 


















^"-r 






o 

CM 






















cm 

CO 














/Ac 


Jo 








O 

o 












//£>> 


>o 








1— 

CM 
CO 












o/ 










o 

CO 










o 




Ashumet 
Pond 




o 

CM 
CO 






p. 


o\ 




> 
o 














o 
CO 


^ 




o 
















o 

CM 

CO 
















15 30 6( 


3 90 


120 Feet 


o 














3 © 12 18 2d Meters 

1 1 1 1 1 ' 


o 

CM 
CO 



280010 280030 280050 280070 280090 280110 



.M 




Legend 



Data Source: USGS, August 2006 



Temporary Drive Point 



Dissolved Ammonium 

In Milligrams Per Liter 

AsN 

' 2.25 




Note: Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. Extent of the 
geochemical barrier determined using GPS by CH2M Hill in October 2006. State plane coordinates 
in NAD83 (meters). 



FIGURE 2-8 

CHANGES IN AMMONIUM 
CONCENTRATIONS WITH DEPTH IN 
THE GEOCHEMICAL BARRIER 

AFCEE - Massachusetts Military Reservation 

Final Ashumet Pond 2006 Phosphorus Barrier Technical 

Memorandum 

CH2MHILL — 



Y:\Figures\SPEIM\APB\2006\TechMemo\Corel\APR_06TM_Fig02-09.cdr jgh 1/8/07 



0.5 FEET 





280010 
I 


280030 

l 


280050 

1 


28007 





28009 





28011 





















to 

o 

CO 




















o 


























1 

CM 
CO 














\ c 


o 






o_ 












/"CO 

1 


f ° 






CM 
O 

CM 

00 












' o£ 


















. A f°A 


OIL 

/ ° 








O 

o 
1- 
CM 
CO 












W^o/ 


*o 








o_ 








o 










00 

s 

CM 
CO 




A A / O ft / 


o 








Po 


imet 
nci 




o_ 








> 












o 

CM 

00 








o 
















°- 












15 3 


& 


1 90 


120 


Feet 


o 

CM 




3 6 12 18 24 Meters 






















1 







280050 



280070 



280090 



280110 



Depth Below Pond Bottom 



1.5 FEET 



28001 





280030 


280050 


280070 
! 


280090 
\ 


280110 

i 






























































































































JM o/ 




















/ o / 


















/j^^m°/ 






















/ o 


















K^f/ 








Ashumet 
Pond 










\^y 






^ 






































15 30 60 90 120 Feet 
















3 6 12 18 24 Meters 





























280010 



280030 



280050 



280070 



3.0 FEET 



280010 
I 


280030 
1 


280050 


280070 


280090 


280110 

1 




























































































jtj'o 






















Jm*/* 






















l^k 






















/ o/ 































































w & ° 






Asht met 
Pond 
































o 






























15 30 60 90 


120 Feet 














3 6 12 18 24 Meters 




1 

280010 


1 
280030 


1 \ 

280050 


1 

280070 


1 

280090 


1 
280110 








Legend 

o Temporary Drive Point 

A Temporary Push Point - Field Measurements Only 



Data Source: USGS, August 2006 



Specific Conductance 
In Microsiemens Per 
Centimeter 

' 300 




Note: Shoreline position determined by GPS on 7/28/06 by the US Geological Survey Extent of the 
geochemical barrier determined using GPS by CH2M Hill in October 2006. State plane coordinates 
in NAD83 (meters). 



50 



FIGURE 2-9 

CHANGES IN SPECIFIC 
CONDUCTANCE WITH DEPTH IN THE 
GEOCHEMICAL BARRIER 

AFCEE - Massachusetts Military Reservation 

Final Ashumet Pond 2006 Phosphorus Barrier Technical 

Memorandum 

CH2MHILL 



Y:\Figures\SPEIM\APB\2006\TechMemo\Corel\APR_06TM_Fig02-10.cdr 02/05/07 mcb 



0.5 FEET 



280010 280030 280050 280070 280090 280110 





















/ 






















/ 
























/ 
























171 


















i/ 0. 




















/°° a 


W A 




















°%, 


VjLk^kY 





















































/%A 






Ashu 
Pot 


vet 
d 








$ 


o\ 


<fe >*> 












































15 3 


6< 


) 90 120 Feet 






1 








3 6 


1? 13 24 Meters 

1 1 1 



280010 



280030 280050 



Depth Below Pond Bottom 



1.5 FEET 



280 


110 


280030 
f 


280050 

1 


280070 

| 


280090 

1 


280110 
























































































































7°° a / 














/ad °/ 


















7°° 


•/ 


















% , 


/ o 




















Ashumet 
Pond 




/ <r «bj/ 
















O 
































15 30 60 90 120 Feet 


















3 6 12 M 


24 Meiers 


280 


110 


280 


530 


280 


ISO 


i 

280070 


1 

280090 


1 

280110 



3.0 FEET 



280010 


280030 


280050 

1 


280070 


280090 


280110 


















_ 




































































\f^k\ 








































/*o / 


















/j°sA 
























f°°°7 






















/ 5 «• 


O 


















Af°°os*^ 




Ashumet 
Pond 






<o 


















% 





































15 30 60 90 


120 Feet 


_ 
















3 6 12 tl 


24 Meters 































280010 280030 280050 280070 



IUSGS 



hMMMiLUMMUMLUiLJ 



Legend 



Data Source: USGS, August 2006 



Temporary Drive Point 



Dissolved Oxygen 
In Milligrams Per 
Liter 

10 




Note: Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. Extent of the 
geochemical barrier determined using GPS by CH2M Hill in October 2006. State plane coordinates 
in NAD83 (meters). 



FIGURE 2-10 

CHANGES IN DISSOLVED OXYGEN 
CONCENTRATIONS WITH DEPTH IN 
THE GEOCHEMICAL BARRIER 

AFCEE - Massachusetts Military Reservation 

Final Ashumet Pond 2006 Phosphorus Barrier Technical 

Memorandum 

CH2MHILL — 



Y:\Figures\SPEIM\APB\2006\TechMemo\Corel\APR_06TM_Fig02-11 .cdr 02/05/07 mcb 



Depth Below Pond Bottom 



0.5 FEET 

280010 280030 2800S0 280070 280090 280110 



1.5 FEET 



3.0 FEET 



o 


























s 
























CM 

oo 


























o 
3 


























CM 

oo 


















mL° 






s 
















>o^B / o 




CM 
00 
















°0 o / 




o 






















cm 

oo 






















o 

s 














^0 

o 


' o 










o 

CM 

oo 












o 






Ashur 
Pon 




o 
to 






ft 


° » 


<h 


s° 












CM 

oo 







O 














o 














15 3 


6( 


] 90 


120 Feet 


CM 

oo 




3 6 12 18 24 Meiers 





























28C 


010 


280030 


280050 


280070 


280090 


280110 




















^ 












































































































° olm 


















°o 


















/^P 
















q/ 


I / u 


















J^O 


Ashumet 
Pond 










^^m 




























15 30 60 90 


120 Feet 








3 6 


12 18 2J Meiers 



























280010 


280030 


280050 

1 


280070 


280090 


280110 


o 


























io 


























t- 

CM 
00 


























o 


















C?0 






CM 
CO 
















j£"*7 






o 

CM 














7°° a 7 








CM 
CD 






















o 
o 














7°°°/ 


'O 








1- 

CM 

to 












^ 


8 / ° 










o 

CO 










Q 9C 


O 




Ashumet 
Pond 




o 

CM 
CO 






ft 


o\ 


***/ 














o 




% 





o 
















o 

CN 
CO 












15 3D 60 90 


120 


Feet 


o 

.Ok 


3 6 12 11 


24 Meters 


CM 

CO 





























280010 280030 280050 280070 280090 280110 



280010 280030 280050 280070 280090 280110 



280010 280030 280050 280070 280090 280110 



SE 



OB 



Uiik^U 



Legend 



Data Source: USGS, August 2006 



Temporary Drive Point 



Note: Shoreline position determined by GPS on 7/28/06 by the US Geological Survey. Extent of the 
geochemical barrier determined using GPS by CH2M Hill in October 2006. State plane coordinates 
in NAD83 (meters). 



PH 
Standard Units 



■ 



5.0 



FIGURE 2-11 



CHANGES IN pH WITH DEPTH IN THE 
GEOCHEMICAL BARRIER 

AFCEE - Massachusetts Military Reservation 

Final Ashumet Pond 2006 Phosphorus Barrier Technical 

Memorandum 



CH2MHILL 



Y:\Figures\SPEIM\APB\2006\TechMemo\Corel\APR_06TM_Fig02-12.cdr 02/28/07 mcb 



0.5 FEET 



o 


280010 

I 


280030 

l 


280050 

1 


280070 

1 


280090 

1 


280110 

1 


to 




CM 
00 




















o 




















CN 
















A 


Jo 




o 

CM 














J* / o 
To* / ° 




csi 
oo 








~jj °°/ 






o 
o 




















CM 

w 








x^«^° 








s 










/*2fe> y 










00 








y/A, 







/ 


<\shun 
Pon 


let 
1 




O 
CD 






•^ 












o 

CM 

CO 















s 
















15 3 


9 


) 90 120 


Feet 


o 

CM 

00 
















3 


12 19 24 Meters 






I 


nn 


?nn 


iin 


1 1 


i^n 


7RT\ 


17 n 


ORft 


iqn 


280 


110 



Depth Below Pond Bottom 



1.5 FEET 



280010 


280030 

1 


280050 

1 


280070 

1 


280090 

1 


280110 

1 




/ 














/ 


















/ 






















L 


















y/oo r ° 


























//<? 
















/AoV 
















/ s^< ° 














/y°o/ 




Ashumet 
Pond 






















































15 30 60 90 


120 Feet 






















3 6 12 IE 


24 Meiers 



























280010 280030 280050 280070 280000 280110 



3.0 FEET 



280010 


280030 

1 


280050 

1 


280070 

1 


280090 

1 


280110 

I 






to 
























CM 
00 






















o 
















[7* 






CN 
CO 














jT^l 






o 

CM 












in° 7 








CM 
CO 






















O 

o 












y/oTV 

s yoo /** « 








CM 












o/' f O 










o 

CO 












'o 

■ 


Aahumet 

Pond 




CO 






^s^ o\ 














o 




o 














o 

CN 
CO 
















15 30 60 90 


120 Feet 


o 
— en 














D 3 6 12 13 2J Meiers 


o 
csj 
CO 


1 

280010 


1 

280030 


280050 


1 

280070 


1 
280090 


1 
280110 








Legend 

o Temporary Drive Point 

▲ Temporary Drive Point - Field Measurements Only 



Note: Shoreline position determined by GPS on 7/28/06 by the US Geological Survey Extent of the 
geochemical barrier determined using GPS by CH2M Hill in October 2006. State plane coordinates 
in NAD83 (meters). 



Data Source: USGS, August 2006 



Temperature C 
28 




13 



FIGURE 2-12 

CHANGES IN GROUNDWATER 
TEMPERATURE WITH DEPTH IN THE 
GEOCHEMICAL BARRIER 

AFCEE - Massachusetts Military Reservation 

Final Ashumet Pond 2006 Phosphorus Barrier Technical 

Memorandum 

CH2MHILL 



Last Opened 2/26/2007 9:56:15 AM by MC Y:\Figures\SPEIM\APB\2QQ6\TechMemo\GIS\Arcmap\APB_06TM_Fig03-01.mxd 




Legend 

O 



Sediment Sample Location 
Drive Point Sample Location 

Co-located Sediment/Drive 
Point Sample 

2005 Drive Point Sample Location 

Shoreline (Delineated by USGS 
July, 2006) 

*Barrier Boundary 



*Barrier boundary delineated by ECC; shoreward 
edge refined based on GPS readings. 



O 

A 



N 

! 



40 80 



Feet 



Data Source: AFCEE, MMR-AFCEE Data Warehouse. 
1997 Aerial Photography from AFCEE. 



FIGURE 3-1 

AFCEE TEMPORARY DRIVE 
POINT AND SEDIMENT 
SAMPLING LOCATIONS 

AFCEE - Massachusetts Military Reservation 
Final Ashumet Pond 2006 Phosphorus 
Barrier Technical Memorandum 

CH2MHILL - 



Table 3-1 

2006 AFCEE Temporary Drive Point Barrier Groundwater Geochemistry Data 

Final Ashumet Pond 2006 Phosphorus Barrier Technical Memorandum 



Location 


Sampling 
Date 


Screen 
Interval 
(ft bpb) 


Mid-Screen 
Depth 
(ft bpb) 


PH 

(std) 


Alkalinity (as 
CaC0 3 ) 
(mg/L) 


Dissolved 
Barium 

(^g/L) 


Dissolved 
Calcium 

(^g/L) 


Chloride 
(mg/L) 


Dissolved 
Iron (\ig/L) 


Dissolved 
Magnesium 

(^g/L) 


Dissolved 
Manganese 

(^g/L) 


Methane 

(^g/L) 


Ammonium-N 
(mg/L) 


Nitrate-N 
(mg/L) 


Sulfate 
(mg/L) 


Dissolved 
Sodium 

(^g/L) 


Total 

Dissolved 

Phosphorus 

(mg/L) 


Dissolved 
Orthophosphate 

(asP) 
(mg/L) 


95DPB0225** 


6/2/2005 
6/2/2005 


1.0 to 2.0 


1.5 


6.14 


45 


12 


11000 


NS 


36 


5400 


3100 


0.57J 


NS 


NS 


24 


12000 


0.970 


NS 


95DPB0225** 


3.5 to 4.5 


4.0 


6.20 


48 


13 


11000 


NS 


21 


5800 


4200 


0.74J 


NS 


NS 


24 


12000 


1.000 


NS 








































95DP3007* 


1 0/3/2006 


0.6 to 1.0 


0.8 


6.37 


15J 


30J 


5800 


7.1 


ND 


2100 


35 


ND 


ND 


2.33 


14 


8300 


ND 


NS 


95DP3007* 


10/3/2006 


3.5 to 4.5 


4.0 


6.20 


14J 


35J 


6000 


7.4 


ND 


2100 


29 


ND 


ND 


2.38 


13 


8400 


ND 


ND 








































95DP3008* 


1 0/3/2006 


0.6 to 1.0 


0.8 


6.06 


11J 


34J 


2900J 


25 


1400 


2000J 


2300 


24 


0.13 


0.003J 


7 


12000 


0.015 


NS 


95DP3008* 


10/3/2006 


3.5 to 4.5 


4.0 


5.99 


25 


41J 


7500 


28 


ND 


3900J 


2100 


0.37J 


0.32 


0.65 


18 


14000 


0.034 


0.0223J 








































95DP3009 


1 0/4/2006 


0.6 to 1.0 


0.8 


8.40 


26 


5.7J 


3200J 


26 


ND 


1700J 


1000 


130 


0.31 


0.0137 


1.1 


18000 


0.052 


NS 


95DP3009 


10/4/2006 


3.5 to 4.5 


4.0 


7.04 


14J 


6.9J 


3200J 


23 


410 


1400J 


2000 


0.47J 


0.16 


0.615 


10 


16000 


0.981 


0.791J 








































95DP3010 


10/4/2006 


0.6 to 1.0 


0.8 


7.29 


25 


11J 


4400J 


26 


830 


2400J 


1800 


76 


0.49 


0.0063 


7.1 


17000 


0.036 


NS 


95DP3010 


1 0/4/2006 


3.5 to 4.5 


4.0 


6.68 


18J 


4.2J 


4800J 


30 


340 


2600J 


2000 


0.2J 


0.64 


0.0022J 


14 


20000 


1.802 


1.616J 








































95DP3011 


1 0/4/2006 


0.6 to 1.0 


0.8 


6.63 


66 


35J 


9900 


25 


32000 


6100 


4200 


360 


0.59 


0.1921 


ND 


9500 


0.004 


NS 


95DP3011 


10/4/2006 


3.5 to 4.5 


4.0 


6.77 


45 


12J 


10000 


20 


1100 


6300 


3900 


85 


0.87 


0.1486 


20 


9800 


1.415 


1 .088J 








































95DP3012 


10/4/2006 


0.6 to 1.0 


0.8 


6.88 


63 


39J 


11000 


25 


10000 


6200 


3500 


610 


0.63 


ND 


ND 


12000 


0.025 


NS 


95DP3012 


1 0/5/2006 


3.5 to 4.5 


4.0 


6.91 


36 


7.7J 


9700 


28 


1100 


5900 


2400 


9.9 


0.73 


ND 


17 


13000 


1.507 


0.827J 








































95DP3014 


1 0/5/2006 


0.6 to 1.0 


0.8 


6.55 


8.5J 


12J 


9500 


49 


7300 


3500J 


1200 


44 


ND 


ND 


10 


17000 


0.022 


NS 


95DP3014 


10/5/2006 


3.5 to 4.5 


4.0 


6.42 


ND 


14J 


9300 


50 


900 


3700J 


2100 


0.35J 


ND 


0.534 


14 


19000 


0.336 


0.21 9J 



Key: 

ft bpb = feet below pond bottom 

J = estimated data 

mg/L= milligrams per liter 

NS = not sampled 

std = standard units 

|jg/L= micrograms per liter 



* Background location 95DPB0225 
sampled in June 2005 

Background locations 95DP3007 and 
95DP3008 sampled in October 2006 



M:\Projects\337105\Technical Services\Ashumet Pond\Tech Memoranda\Barrierdata_Tech memos\2006 Barrier report\Tables\Table 3-1.xls 
3/1 9/2007 



Page 1 of 1 



Table 3-2 

2006 AFCEE Barrier and Pond Surface Sediment Data 

Final Ashumet Pond 2006 Phosphorus Barrier Technical Memorandum 



Sediment Sampling 
Location 


Sampling Date 


Total Iron 
(mg/kg) 


Total Phosphorus 
(mg/kg) 


Total Manganese 
(mg/kg) 


95SE0001 


1 0/2/2006 


4700 


110 


54 


95SE0002 


1 0/2/2006 


1900 


62 


34 


95SE0003 


1 0/2/2006 


1600 


43 


500J 


95SE0007 


1 0/2/2006 


380 


25J 


70 


95SE0009 


1 0/5/2006 


64000 


NA 


1500 


95SE0010 


1 0/5/2006 


79000J 


140J 


1400 


95SE0011 


1 0/5/2006 


74000 


100 


980 


95SE0012 


1 0/5/2006 


23000 


100 


800 


95SE0014 


1 0/5/2006 


66000 


ND 


700 


95SE0015 


1 0/5/2006 


130000 


140 


1500 


95SE0016 


1 0/5/2006 


18000 


450 


2000 


95SE0017 


1 0/5/2006 


10000 


330 


700 


95SE0018 


1 0/5/2006 


2100 


48 


400 



Key: 

J = estimated value 

mg/kg = milligrams per kilograms 

NA = Not Analyzed 

ND = Non Detect 



M:\Projects\337105\Technical Services\Ashumet PondVTech Memoranda\Barrier data_Tech memos\ 
2006 Barrier report\Tables\Table 3-2.xls p . , , 

3/19/2007 rage i ot i